I have been trying to determine what options I have for allowing guest users to sign in to SharePoint Online sites. My search results often suggest that federation with Google and Facebook is possible, but I think that these are only options for in-house applications. The only authentication options for SharePoint guests appear to be logging in with Microsoft accounts or having one-time codes sent to them via e-mail. Am I wrong?
See https://docs.microsoft.com/en-us/sharepoint/sharepoint-azureb2b-integration.
Azure B2B Invitation Manager one-time passcode feature allows users who do not have existing Work or School accounts or Microsoft Accounts to not have to create accounts in order to authenticate, but can instead use the one time passcode to verify their identity.
So you're correct, OTP or MSA/OrgId.
That's correct, there are no other authentication options other than what is listed in the B2B page.
Hello anonymous user ,
Welcome to Q&A Forum!
I agree with @trevorseward .
In both Azure AD B2B collaboration and Microsoft 365 external sharing (OneDrive, SharePoint Online, Unified Groups, etc.), external users are authenticated by using Azure AD B2B.
For more information, please refer to this article.
Thanks,
Echo Du
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