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Hello,
After investigating, this appears to be an issue on Microsoft’s side that started yesterday and is still not fully resolved. It is currently affecting many users and different mail clients, not just Aqua Mail.
The repeated authentication loop you are seeing is consistent with this Microsoft sign-in problem. Unfortunately, there is nothing we can fix from the Aqua Mail side at the moment.
For now, the best option is to wait and try again later while we continue to monitor the situation. We also recommend keeping an eye on Microsoft’s service status, as the login flow should start working normally again once they resolve the issue on their side.
Sorry for the inconvenience.