I wanted to use the Microsoft Teams app on macOS to login to my personal Office 365 account, but I recently used it to login to my corporate account. That did not work out very well: Teams got into an “endless loop” asking me to sign in over and over again. It looks like Teams has some issues when switching between different accounts.
I got this solved by opening Keychain Access, and deleting the entry called Microsoft Teams Identities Cache. After that, I could sign in to Teams again with the correct account.
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thank you very much – this solved my problem.
I previously used Teams on macOS on a different Office 365 tenant, and there must have been some stored credentials in KeyChain that were causing a login loop.