question

@lucafabbri365 ,
I understand that you are trying to get information on whether we have a PowerShell cmdlet to obtain the Identity Issuer information for any Azure AD User . I tried three different PowerShell modules related to user information and this is currently not available through PowerShell . I am assuming that you are trying to get information on your external guest users from other tenants who have been invited like you see on the portal .

I tried three different powershell modules as below but could not get that exact information in any of them . So I can conclude that this information is only available from portal as seen above and not using any powershell cmdlet at this point .

• Get-MsolUser
  

• Get-AzureAD
  

• Get-MgUser

  
  

     PS C:\> Get-MsolUser -ObjectId 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a | fl
          
          
       ExtensionData                          : System.Runtime.Serialization.ExtensionDataObject
       AlternateEmailAddresses                : {adm@0000000.onmicrosoft.com}
       AlternateMobilePhones                  : {}
       AlternativeSecurityIds                 : {16 3 191 253 139 203 84 181}
       BlockCredential                        : False
       City                                   : 
       CloudExchangeRecipientDisplayType      : 6
       Country                                : 
       Department                             : 
       DirSyncProvisioningErrors              : {}
       DisplayName                            : Umbrella A
       Errors                                 : 
       Fax                                    : 
       FirstName                              : shashi
       ImmutableId                            : 
       IndirectLicenseErrors                  : {}
       IsBlackberryUser                       : False
       IsLicensed                             : False
       LastDirSyncTime                        : 
       LastName                               : 
       LastPasswordChangeTimestamp            : 6/23/2020 5:11:13 PM
       LicenseAssignmentDetails               : {}
       LicenseReconciliationNeeded            : False
       Licenses                               : {}
       LiveId                                 : 1003200000000000
       MSExchRecipientTypeDetails             : 
       MSRtcSipDeploymentLocator              : 
       MSRtcSipPrimaryUserAddress             : 
       MobilePhone                            : 
       ObjectId                               : 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a
       Office                                 : 
       OverallProvisioningStatus              : None
       PasswordNeverExpires                   : 
       PasswordResetNotRequiredDuringActivate : 
       PhoneNumber                            : 
       PortalSettings                         : 
       PostalCode                             : 
       PreferredDataLocation                  : 
       PreferredLanguage                      : 
       ProxyAddresses                         : {SMTP:adm@0000000.onmicrosoft.com}
       ReleaseTrack                           : 
       ServiceInformation                     : {}
       SignInName                             : adm@0000000.onmicrosoft.com
       SoftDeletionTimestamp                  : 
       State                                  : 
       StreetAddress                          : 
       StrongAuthenticationMethods            : {Microsoft.Online.Administration.StrongAuthenticationMethod, Microsoft.Online.Administration.StrongAuthenticationMethod}
       StrongAuthenticationPhoneAppDetails    : {}
       StrongAuthenticationProofupTime        : 
       StrongAuthenticationRequirements       : {}
       StrongAuthenticationUserDetails        : 
       StrongPasswordRequired                 : 
       StsRefreshTokensValidFrom              : 6/23/2020 5:11:13 PM
       Title                                  : 
       UsageLocation                          : IN
       UserLandingPageIdentifierForO365Shell  : 
       UserPrincipalName                      : adm_0000000.onmicrosoft.com#EXT#@A1111.onmicrosoft.com
       UserThemeIdentifierForO365Shell        : 
       UserType                               : Guest
       ValidationStatus                       : Healthy
       WhenCreated                            : 6/23/2020 5:11:13 PM
  

  
  
  

If you use the Get-AzureADUser cmdlet then you can filter them by value of CreationType parameter which will be Invitation for external users always. It will include everyone who has redeemed an invitation which will give you list of all users who are external users in the tenant. (this includes Microsoft Account and B2B users from external AzureAD tenant)

 PS C:\> get-AzureADUser -ObjectId 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a | fl
    
 ExtensionProperty              : {[odata.metadata, https://graph.windows.net/adfxxxxa-xxxx-xxxx-xxxx-581xxxx7a74f/$metadata#directoryObjects/@Element], [odata.type, 
                                  Microsoft.DirectoryServices.User], [createdDateTime, 6/23/2020 5:11:13 PM], [employeeId, ]...}
 DeletionTimestamp              : 
 ObjectId                       : 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a
 ObjectType                     : User
 AccountEnabled                 : True
 AgeGroup                       : 
 AssignedLicenses               : {}
 AssignedPlans                  : {}
 City                           : 
 CompanyName                    : 
 ConsentProvidedForMinor        : 
 Country                        : 
 CreationType                   : Invitation
 Department                     : 
 DirSyncEnabled                 : 
 DisplayName                    : Umbrella Admin
 FacsimileTelephoneNumber       : 
 GivenName                      : shashi
 IsCompromised                  : 
 ImmutableId                    : 
 JobTitle                       : 
 LastDirSyncTime                : 
 LegalAgeGroupClassification    : 
 Mail                           : adm@0000000.onmicrosoft.com
 MailNickName                   : adm_0000000.onmicrosoft.com#EXT#
 Mobile                         : 
 OnPremisesSecurityIdentifier   : 
 OtherMails                     : {adm@0000000.onmicrosoft.com}
 PasswordPolicies               : 
 PasswordProfile                : 
 PhysicalDeliveryOfficeName     : 
 PostalCode                     : 
 PreferredLanguage              : 
 ProvisionedPlans               : {}
 ProvisioningErrors             : {}
 ProxyAddresses                 : {SMTP:adm@0000000.onmicrosoft.com}
 RefreshTokensValidFromDateTime : 6/23/2020 5:11:13 PM
 ShowInAddressList              : False
 SignInNames                    : {}
 SipProxyAddress                : 
 State                          : 
 StreetAddress                  : 
 Surname                        : shailaj
 TelephoneNumber                : 
 UsageLocation                  : IN
 UserPrincipalName              : adm_0000000.onmicrosoft.com#EXT#@x11111.onmicrosoft.com
 UserState                      : Accepted
 UserStateChangedOn             : 2020-06-23T17:11:52Z
 UserType                       : Guest

I tried checking the extension attribute as well however it does not have the Issuer Identity information as well

 PS C:\> Get-AzureADUserExtension -ObjectId 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a | fl
    
    
 Key   : odata.metadata
 Value : https://graph.windows.net/adfxxxxa-xxxx-xxxx-xxxx-581xxxx7a74f/$metadata#directoryObjects/@Element
    
 Key   : odata.type
 Value : Microsoft.DirectoryServices.User
    
 Key   : createdDateTime
 Value : 6/23/2020 5:11:13 PM
    
 Key   : employeeId
 Value : 
    
 Key   : onPremisesDistinguishedName
 Value : 
    
 Key   : userIdentities
 Value : []

I also tried the Microsoft Graph powershell module for querying the users as well but that also does not provide this kind of information for users from external directory

 PS C:\> Get-MgUser -UserId 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a | fl
    
    
 AboutMe                               : 
 AccountEnabled                        : 
 Activities                            : 
 AgeGroup                              : 
 AgreementAcceptances                  : 
 AppRoleAssignments                    : 
 AssignedLicenses                      : 
 AssignedPlans                         : 
 Authentication                        : Microsoft.Graph.PowerShell.Models.MicrosoftGraphAuthentication1
 Birthday                              : 
 BusinessPhones                        : {}
 Calendar                              : Microsoft.Graph.PowerShell.Models.MicrosoftGraphCalendar1
 CalendarGroups                        : 
 CalendarView                          : 
 Calendars                             : 
 Chats                                 : 
 City                                  : 
 CompanyName                           : 
 ConsentProvidedForMinor               : 
 ContactFolders                        : 
 Contacts                              : 
 Country                               : 
 CreatedDateTime                       : 
 CreatedObjects                        : 
 CreationType                          : 
 DeletedDateTime                       : 
 Department                            : 
 DeviceEnrollmentLimit                 : 
 DeviceManagementTroubleshootingEvents : 
 DirectReports                         : 
 DisplayName                           : Umbrella A
 Drive                                 : Microsoft.Graph.PowerShell.Models.MicrosoftGraphDrive1
 Drives                                : 
 EmployeeHireDate                      : 
 EmployeeId                            : 
 EmployeeOrgData                       : Microsoft.Graph.PowerShell.Models.MicrosoftGraphEmployeeOrgData
 EmployeeType                          : 
 Events                                : 
 Extensions                            : 
 ExternalUserState                     : 
 ExternalUserStateChangeDateTime       : 
 FaxNumber                             : 
 FollowedSites                         : 
 GivenName                             : sam
 HireDate                              : 
 Id                                    : 13d6b73e-xxxx-xxxx-xxxx-974125e0e66a
 Identities                            : 
 ImAddresses                           : 
 InferenceClassification               : Microsoft.Graph.PowerShell.Models.MicrosoftGraphInferenceClassification
 Insights                              : Microsoft.Graph.PowerShell.Models.MicrosoftGraphOfficeGraphInsights
 Interests                             : 
 IsResourceAccount                     : 
 JobTitle                              : 
 JoinedTeams                           : 
 LastPasswordChangeDateTime            : 
 LegalAgeGroupClassification           : 
 LicenseAssignmentStates               : 
 LicenseDetails                        : 
 Mail                                  : adm@0000000.onmicrosoft.com
 MailFolders                           : 
 MailNickname                          : 
 MailboxSettings                       : Microsoft.Graph.PowerShell.Models.MicrosoftGraphMailboxSettings1
 ManagedAppRegistrations               : 
 ManagedDevices                        : 
 Manager                               : Microsoft.Graph.PowerShell.Models.MicrosoftGraphDirectoryObject
 MemberOf                              : 
 Messages                              : 
 MobilePhone                           : 
 MySite                                : 
 Oauth2PermissionGrants                : 
 OfficeLocation                        : 
 OnPremisesDistinguishedName           : 
 OnPremisesDomainName                  : 
 OnPremisesExtensionAttributes         : Microsoft.Graph.PowerShell.Models.MicrosoftGraphOnPremisesExtensionAttributes
 OnPremisesImmutableId                 : 
 OnPremisesLastSyncDateTime            : 
 OnPremisesProvisioningErrors          : 
 OnPremisesSamAccountName              : 
 OnPremisesSecurityIdentifier          : 
 OnPremisesSyncEnabled                 : 
 OnPremisesUserPrincipalName           : 
 Onenote                               : Microsoft.Graph.PowerShell.Models.MicrosoftGraphOnenote1
 OnlineMeetings                        : 
 OtherMails                            : 
 Outlook                               : Microsoft.Graph.PowerShell.Models.MicrosoftGraphOutlookUser1
 OwnedDevices                          : 
 OwnedObjects                          : 
 PasswordPolicies                      : 
 PasswordProfile                       : Microsoft.Graph.PowerShell.Models.MicrosoftGraphPasswordProfile
 PastProjects                          : 
 People                                : 
 Photo                                 : Microsoft.Graph.PowerShell.Models.MicrosoftGraphProfilePhoto
 Photos                                : 
 Planner                               : Microsoft.Graph.PowerShell.Models.MicrosoftGraphPlannerUser1
 PostalCode                            : 
 PreferredLanguage                     : 
 PreferredName                         : 
 Presence                              : Microsoft.Graph.PowerShell.Models.MicrosoftGraphPresence1
 ProvisionedPlans                      : 
 ProxyAddresses                        : 
 RegisteredDevices                     : 
 Responsibilities                      : 
 Schools                               : 
 ScopedRoleMemberOf                    : 
 Settings                              : Microsoft.Graph.PowerShell.Models.MicrosoftGraphUserSettings1
 ShowInAddressList                     : 
 SignInSessionsValidFromDateTime       : 
 Skills                                : 
 State                                 : 
 StreetAddress                         : 
 Surname                               : sm
 Teamwork                              : Microsoft.Graph.PowerShell.Models.MicrosoftGraphUserTeamwork1
 Todo                                  : Microsoft.Graph.PowerShell.Models.MicrosoftGraphTodo
 TransitiveMemberOf                    : 
 UsageLocation                         : 
 UserPrincipalName                     : adm_0000000.onmicrosoft.com#EXT#@A111.onmicrosoft.com
 UserType                              : 
 AdditionalProperties                  : {[@odata.context, https://graph.microsoft.com/v1.0/$metadata#users/$entity]}

Hope this helps. Unfortunately the information you require is not available at the moment through any powershell cmdlet and only available from the portal. If the information shared is useful , please do accept the post as answer as it will be helpful to other community members searching the similar queries. Should you have any other query , do let us know and we will be happy to help .

Thank you.

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