Additional chat-related features and issues within Microsoft Teams for Education
Dear AulDaffa,
Thanks for choosing Microsoft community!
I have read your question carefully and done some research, please kindly refer to following suggestions:
You can certainly cancel your request by referring simply to: To accept or deny pending requests, go to your team in the teams list and select More options > Manage team > Pending Requests. To request someone be added to a team you're already a member of, go to the team in your team list then select More options
> Add member. Type the name of one or more people then select Send request. Team owners will receive an alert that they have a pending request.
Sorry about the second half of your sentence I do not understand very well, can you give me a more specific description?
To narrow down the scope of question, I would like to confirm whether did you get any error message or error code?
Hope this help you, if there is any deviation in my understanding, please forgive me and provide me with more details. I am more than happy to continue to help you. I wish you a smooth new year and all the best!
Best regards,
Kerry