Very, VERY annoying. 1. 2FA only works for 30 seconds, not for 30 DAYS. I have to reauthorize on every single logon no matter how I leave the client after playing. 2. After last IOS-beta update of 14 march, all of a sudden you are logged out from the client AND get a meaningless sign-on-via-IOS-game-center button which evidently does not know your OSRS logon credentials. ( SEE ALSO Quick find code: 429-430-245-66090590 )
Despite all the non-helpful tips, it MUST be sth at jagex side.
I have the same problem. I have to re-enter my login credentials everytime after not using the app for over 5 minutes. playing on on IOS 12.1.4 currently and this issue first started happening a little over a week ago, had no problems before then and no settings on my phone have been changed. OSRS has access to data and isnt restricted anywhere in my phone's settings.