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Guest Users vs. External Users
At this point, I cannot see any difference between the two wordings: it appears to me that "Guest User" and "External User" have exactly the same meaning, with the former being only a more "modern" w...
We use the terms interchangeably at Microsoft as well. External user is an older term from back when all "guests" in the directory authenticated outside of the home tenant. When we added support for managed guest users (i.e. the user authenticates inside the home tenant), the "external" piece stopped making sense and "guest user" was born.
And as with many of these types of things, we ended up using both names to refer to the same set of features. If there is a feature/scenario where this language does make a difference, we try to make sure it's clearly labeled to avoid confusion.
Thanks,
Stephen Rice
OneDrive Program Manager II
Yes, you can delete from AzureAD and invite again. There really isn't a way to prevent where they come in from because they are essentially mapping their account to the guest account that is setup in your AD to theirs. You can recommend to that user to right click and open the invite link with Incongnito tab so they can make sure to select the right login to use.
Ref: open the invite link with Incognito tab - yes, this really is the only way to make sure the guest signs in properly by making them enter and verify the right account and credentials.
BTW: I seem to have more success if I send them to SharePoint first rather than Teams or OWA - do these different URLs change the guest-register-in-AD experience?
https://outlook.office365.com/owa/account@realm/groupsubscription.ashx?realm=realm&source=WelcomeEmail&action=files
https://teams.microsoft.com/l/team/guid1(thread.skype/conversations?tenantId=guid2
https://realm.sharepoint.com/sites/site/Shared%20Documents/
BTW: I seem to have more success if I send them to SharePoint first rather than Teams or OWA - do these different URLs change the guest-register-in-AD experience?
https://outlook.office365.com/owa/account@realm/groupsubscription.ashx?realm=realm&source=WelcomeEmail&action=files
https://teams.microsoft.com/l/team/guid1(thread.skype/conversations?tenantId=guid2
https://realm.sharepoint.com/sites/site/Shared%20Documents/