Microsoft 365 Login with User type Guest

Hello,
I have the following Problem: I implemented on our self hosted intance of zammad, version 6.0.0 the thrid party logn via Microsoft 365. The login works fine as long as the user in Azure AD is a Member. As soon as the User type is changed to Guest the login doesnt work and i get the following error message:

I want our clients to be able to login via Microsoft 365 but i dont want them to be a Member on our M365 Tenant. Is this possbile?

Thanks!

I had to add the following api permission: User.Read.All, now the guest login is working

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