I dont think this is a duplicate of MCD-652 as I did not change my username in Xbox Live. Also after system restore from 2 days before I received Minecraft Dungeon beta invitation I have Installed the Launcher and it did not ask me for creditentials and just gave me an error Login failed, try again - same as on the screenshot.
There seems to be some issue between Launcher and signing to Xbox account? But As I said all other Mojang Minecraft games works fine and Xbox companion works fine.
I think the only thing I didnt try is full system wipe and reinstall Windows.
I am logged in as a main admin user with my Microsoft account. Microsoft store works, Minecraft windows 10 works. Minecraft Java works. Xbox Concole Companion works fine.
Its weird that I do not get a sign in window in the Minecraft Dungeons Launcher but after clicking Green button - Login - few seconds pass and I get Login failed, try again.
I have tried logging in on my friends PC and I can login no problem... something must be wrong with mine but what and why did it work before and now is not...
frustrating.
Now I even went and Restored my system to 2 days before I even got the invitation for Beta and installed the Launcher now and same thing. After clicking Login iget Login Failed please try again..... weird it did work on the day I got the invite for beta
I have tried your solution to uninstall the game and delete the "HKEY_CURRENT_USER > Software > Mojang > Minecraft Dungeons Launcher" in the registry but after rebooting and installing the Launcher again when I get to screen when I see green Login button - I click on it and I get Login Failed, try again - I even didnt go to the screen where you type the creditentials.... so the launcher dont know my login details and still giving me the error.
Its so annoying...
Petr
Your suggestion to remove all ties to xbox live in Credentials manager worked.
After removing all lines with Xbox when I clicked login in Dungeons Launcher the Xbox sign in poped up and I was able to login.
Thank you for your help and hopefully this will help in development also.
Bug can be closed.
Thanks