An error occurred while saving the commentAnton Hvornum commented
I will add that the support article: https://docs.microsoft.com/en-us/microsoftteams/troubleshoot/teams-sign-in/sign-in-loop gave me hope. Although it didn't solve my issues. (I don't mind the example being Edge, self promotion is a thing). But there's no cookies being blocked, I allow all third party cookies and have no addons enabled.