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My scenario is to achieve this: I have two separate domains (Azure AD), ex ABC.com and XYZ.com, both domains have users like user@jaswant .com / @USER @xyz .com, and computers joined to azure ad as ABC.com, so my goal is how to log one of the user from XYZ.com domain to ABC.com joined PC's.
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This is not possible with external identities. If you want them to join Azure AD joined devices, they need to have an identity in the same tenant.
For more information about external identities:
https://learn.microsoft.com/en-us/azure/active-directory/external-identities/compare-with-b2c
This is not for the Outside users, both domains are under the same tenant and both have Azure AD, ABC.com is the primary domain. I want to log one of users from XYZ.com to ABC.com Joined PC's.