“Sign in to confirm that you’re not a bot” usually means your IP is (temporarily) blacklisted by the video server. You can try using a VPN or tor.

Try booting from an usb (with a live linux image) stick and see if you can access your drive.

Authorized by not denying…

I have tried a yubikey on ubuntu without any problems. Could you please describe what exactly isn’t working

In theory, you could make a XMPP bot that can do all these things. Status information and executing simple commands shouldn’t be that hard but interactive commands might need a custom wrapper.