First of all, why isn’t there a U2F subforum? Every other part of the flipper has its own subforum, except U2F?
I successfully setup the Flipper as a U2F device for my Google account, and now I’m trying to do the same in Azure (Office 365). I have enabled FIDO2 for myself in the admin section at https://portal.azure.com. Then after logging into my work account I went to My Sign-Ins and clicked on “Add sign-in method”. In the list I choose “Security Key”, but the setup process fails as it doesn’t see the Flipper.
My guess is that Flipper does not support FIDO2. Will support be added at some later stage?