Device: Tecno pova 5 (Android) | Opera GX

Issue:
When trying to login an app (linktr.ee for example) i get teleported to the default browser (opera GX) and i log in my account, password & email are corrects everything good.
Until i find out that it only logged in the browser and didn't log in the app itself...
I had tried multiple times but same outcome.

I changed the default engine and it worked.