Still using my old trusty Galaxy Tab S 5e but batteryis showing its age. Thinking of Tab S9 which has unofficial LineageOS at XDA, modern CPU and OLED. Cannot find anything else to replace S5e. Most new tablets eithet too big or LCD.

Sorry, I couldn’t manage to read the whole post. Anyway, you may want to try authentik 2024.6 or later. They “reworked proxy provider redirect” in that version. I find it much more stable, but still not perfect. OAuth works great though. Note that 2024.6 requires Postgre db upgrade.