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What will happen to exsisting users if we check the "Guests must sing in using the same account to..

Steel Contributor

Inside the SharePoint online admin center we have the following checkbox "Guests must sing in using the same account to which the sharing invitations were sent":-

 

guests must.png

 

But if we check this checkbox, then it is not clear what will happen to existing external users who might have sing in using different account to which the invitation email was sent,will they still be able to sign in? or this checkbox will affect old and future external users?

Thanks

3 Replies
This only effects the sign up processes or the first invitation of a guest invitation. Once you have a b2b account it won't change it.

@Chris Webbok thanks for the reply. so in other words it will not affect any existing users?

best response confirmed by john john (Steel Contributor)
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best response confirmed by john john (Steel Contributor)