Hi @IBN ,
Please ask the organizer of a problematic meeting to check the Meeting Options of the meeting, make sure the setting of "Who can present" is set to "Everyone":
For more about how to verify this configuration, see Change participant settings for a Teams meeting.
Besides, assuming you are the Teams administrator of your tenant, please go to Teams admin center, check if the following setting of the Meeting policy assigned to your users, ensure it's set to "Everyone, but user can overide":
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