Thanks for the additional info! Thankfully, it worked in ProtonPass 1st try and gave legit 2FA codes, without needing to change any further settings.

I was aware that some authenticators run into errors with Lemmy for one reason or another, but that was forunately not the case here.

Ah, thank you so much! This worked perfectly!

I do believe there is a fix for that, iirc you have to enable ‘Spoof App Signature’ under Settings > ReVanced > Misc.

I think that’s how I fixed it, but if not there are discussions on how to fix this issue over at the ReVanced subreddit.