Late to the discussion, but on desktop the Yubikey requires some packages installed. So integration would not be straightforward, but I guess something can be hacked if need be. To have the OS support it natively is another story as I doubt an app can bring Yubikey's features to other apps, the browser and wherever it is needed...

Hello. I'm replying to myself: it seems that the ticket is still open and ultimately still being processed. Let's wait and see... https://gitlab.com/ubports/development/ubuntu-touch/-/issues/2238

@Keneda This was to inform about this porting. Thanks for the move.

@lduboeuf Thanks for the answer Lionel. Well, i have made some tries but without success. Finally, i have remove the pip3 install of 8.3.1 and reinstall with snap and now it's working. There was something wrong with the blob fdc55cec6c2e

Thank you all! Here are a few path to explore. And some interesting topics to explore.

@Vlad-Nirky good news !