Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi Filmonl,
Sorry for the trouble caused by this issue.
Based on our search, seems like this issue is related to modern authentication of Microsoft Teams.
Microsoft Teams has implemented a better way of signing in, the benefit of modern authentication is that it makes it possible for you to sign in to Microsoft Teams without re-entering your email and password every time you want to start a new session. As you already tried the steps but no luck, there might be something wrong with your domain or your company's Office 365 account.
We sincerely suggest you contact your IT admin with the error code to fix this issue. Here is the article for your reference: Why am I having trouble signing in to Microsoft Teams?
You are welcome to contact us if you need further help.
Best Regards,
Ivy