xbox one does not save the login settings for the youtube app

This method didn't help (I knew about the method and had done it before). What can be done additionally?

This method didn't help (I knew about the method and had done it before). What can be done additionally?

Hello, do you already performed a console power cycle? this will fix most of the times this kind of issues, here are the instructions in the following link:

https://support.xbox.com/en-US/xbox-one/console/power-cycle-console

Let us know if these sugestions fix your issue, or if you need more assistance?

Hello Lexx,

We understand that you're experiencing an issue involving YouTube not saving the information for the account that you entered at the start, which has you sign in multiple times now.

Our suggestion here, if you have not done so this may be due to corruption so we would suggest the
uninstalling of the application,
restart the console, and once again install and attempt to try this method.

Check if the login for the account stays consistent, or if further assistance is needed.

Best wishes!

Does your BF have the other xbox set to auto login? I'm just curious because if he does sometimes having it set to auto login will automatically declare it the home xbox.

When you guys got the second xbox was he the first to log in to it? The first time you sign in to an Xbox One and save your password, that console becomes your home Xbox. I would go into the settings
and look to see which one is set as home and check if auto login is enabled or use the PC and/or have him go to xbox.com, login and click on his gamer pic and then click the link that says my microsoft account or use login.live.com to see which one is actually
set to "Home"