Thanks for your comprehensive answer.

Concerning the Salesforce app, I followed this tutorial : https://docs.microsoft.com/en-us/azure/active-directory/saas-apps/salesforce-tutorial

The app has only "WindowsAzureActiveDirectoryIntegratedApp" :

I would have one more question @MarileeTurscak , is there any mean to get the same info I get with the Microsoft Graph Explorer, but using the Microsoft Graph PowerShell SDK ? I can't find the command that should be something like Get-MgApplications or Get-MgServicePrincipals. Is there any documentation about this?

Thanks in advance

It is empty for Salesforce :

 "samlSingleSignOnSettings": {
                 "relayState": ""
             }