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Dear Fiona Crotty,
Good day!
Thanks for trying the suggestions above, if you still encounter this phenomenon after re-adding this student, it may be a problem on the Teams server side, we kindly recommended you can raise a service request in Microsoft 365 admin center, which the support there has the related permission and resource to help you check from the backend。
Thanks for your cooperation.
Sincerely,
Tin | Microsoft Community Moderator