Weird indeed. For me (also FP3, recently switched to /e/), Itsme (downloaded via Aurora Store) is working but not Payconiq. For Payconiq, I get the following error message:
“A security error occurred. Please ensure that USB debugging is switched off under the developer settings. Make sure your device is not rooted and that a custom ROM is not installed.”
Elswhere I’ve found this, but seems kind of complicated: [HOWTO] Installing Banking Apps - #3 by Githyanki