Issue: Adding invited (guest) user to teams through Teams Admin center seems to not work properly. When invited guest tries to login through web client or the desktop client he/she gets the following error: "You're not on Teams yet, but you can set it up for your organization."
When checking the invited user's team member role in the Teams client, the invited (guest) user appears as Member. If user is invited by the team owner through the client, everything works as it should and the user appears as Guest.
This picture below contains two (guest) users. Linda is invited through Teams Admin center and another one is invited from the Teams Client. Linda's role is falsely showing Member. Linda is showing as Guest in the Teams Admin center and in the Powershell queries.
Workaround until this problem is solved is to invite external (guest) users to the team through the Teams client instead of Teams Admin center.
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The issue is quite similar as described in this post: