xbox one new account asking for pin each time

Hello,

I have been using xbox one under my own xbox one log in for some time - works great.

my wife recently added her own account to the xbox one and it signed her in automatically of course.

She can access the plex server (same account I use as we watch the same stuff) - but has to enter a pin each time.

Is there anyway I can stop the pin from having to be entered if she is signed into her own xbox one account?
The plex pass is linked to my xbox one account - so could that be causing the issue?

Once she enters the pin… it works fine.

Thank you

EDIT: Apologies I found this post: https://forums.plex.tv/discussion/132749/how-to-use-multi-user-on-xbox-one#latest