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in my case, I unconsciously register the Microsoft account of the one at work with my personal email, so it automatically sees 2 accounts as 1, which leads to the problem, so the advice is to register the Microsoft account at work with another email of yours and make sure two in the information of 2 Microsoft accounts are registered with 2 different email accounts, then delete the ms teams in the computer, re-download and use it normally.
in case there are still issues, just restart the computer launch it, it works for me.
hope you succeed