best response confirmed by PapaKnork (New Contributor)
Solution
Hey,

I've had the exact same login issue over the last two days. Same setup, Android device, M365 family subscription, same error messages (unable to switch orgs, access denied, contact your admin) etc. However, I did not receive an invitation to test anything nor did I test "Teams for personal life" on my own before.

Anyway, I just managed to login on my Android device. All I did was adding my personal phone number to my Microsoft account (at account.microsoft.com) and logging in again via the Teams app for Android...and voila, suddenly it worked.

I don't know if this will help you, but I came across your question during my research and thought I'd share my findings here. Hope it might help you.
Best,
Stefan
www.000webhost.com