Autofill on iPad - PIN code not working

Bitwarden on iOS is proving to be a nightmare. First of all it kept asking for my Master Password every time I wanted it to autofill so I set up the PIN code option & that doesn’t work either. The Verify PIN screen keeps popping up, so I enter my PIN, the screen disappears, I select password fill & the Verify PIN screen comes up again. It’s even worse than the MP option as at least that worked. It’s incredibly frustrating.

Any idea why I’m getting this?
iPad Air 4, iOS 15.4.1, Safari browser, other Autofill sources disabled