Endless load screens and E-0020 errors, linked to sign in failures

In preview, the app works perfectly fine with stable internet connection and offline on the fisrt (manual) sign-in and opening of the app.

However, on the second opening of the app and onwards, the app is stuck in a “Signing in with Microsoft/Xbox Live account” loop, whether there is a stable connection or offline. This makes all load screens infinite, and the marketplace and dress room have an E-0020 error screen. This seems to affect the ENTIRE app. IE: creating worlds, opening settings, and the already mentioned; marketplace and the dress room. The only way to leave the loading screen is by closing the app

This does not affect the most recent official release.

I have fully tested this issue multiple times (by fully deleteing the app 2 seperate times, going into and out of beta 3 times, and downloading the most recent official release 3 times as well) , and can confirm it is not a connection issue (used wifi and mobile data) or a server issue (as the app is fine on official release)