I'm curious as to why I have some duplicate users in my organization with a hashtag (#) sign start of their Full Name. I search and found out these are external users. But today one of my user login and system display the user name with a hashtag (#) which cause a lot of errors etc. My questions are that
Is it normal that when we connect with SharePoint or OneDrive this user created and available on the Dynamics 365 user list?
How can we prevent that system should not allow to login with this user
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