Development is going on
I requested preview support for the ticket #52 from YubiKey support team with Ticket #00019088:
We do not support this app. We do know that they have already added support for CR several years ago. As to supporting the developer in getting this working, if they reach out to us we are more than happy to work with them on this.
I passed the piece of information to the developer as a comment in the ticket.
Now, #52 is finally merged to #127.
I will look forward for the preview help in the latest ticket.
I requested preview support from the YubiKey support team for the titket #127 now.
KeePassX Dev
I am studying the project supporting YubiKey DB unlock which can be about the case here.