Strange behavior. Android RVN wallet.

It's my turn to ask help about RVN wallet :-p

This morning, I tried launching the RVN wallet app on my android phone. It asked for fingerprint, ask for fingerprint again (it happens often the fingerprint is asked twice). And then I end up with the following message :

WARNING

Ravencoin wallet cannot be authenticated due to a bug in your version of Android. Please tap here for more information.

Close

If I hit close, the app closes and that's it.

If I click on the link for more info, I end up on the 404 page.

Any of you seen this behavior before ? My app was working fine a few days ago. My phone is using Android 8.0 and there are no possibility to update past that. There are no security updates available either.

Also, I got the same app on my android tablet (ver 7.0) and it works like a charm.

I'm stumped.