Restrict login to M365 Apps

Copper Contributor


Users should be able to sign in only to domain from M365 Apps and sign in to other domains should not be permitted.
For example : When the users launch excel/ M365Apps , they should be able to sign in to domain and should not be able to sign in to any other domains.


Please advise if steps in below article will address the requirement
Ref :




2 Replies is your default domain ? the others domain are located on your tenant or they are external tenants ?

@Ajit Terdalkar 


Cannot fully understand, btw, please take a look in case of B2B:


Allow or block invites to specific organizations - Microsoft Entra | Microsoft Learn