Hello, I received a Yubikey 5 and all is working fine using GPG with it, except integration with Thunderbird on Windows. I followed this guide: https://wiki.mozilla.org/Thunderbird:OpenPGP:Smartcards including 64 windows section I was able to successfully send mail to myself, but then '''thunderbird failed at decrypting this message''': Thunderbird is indicating that key is not available and I see '''no prompt from gpg-agent'''. Key is correctly declared as GPG external. If I try to decrypt tis email by storing it on file and using gpg in command line, it works fine: agent is asking for Yubikey PIN and gpg is decrypting the message. But this is an awful workaround, not user friendly at all. I also did sanity check by sending to myself a message encrypted with a key generated by Thunderbird: all is working fine, the message is decrypted within Thunderbird. => How do you make Thunderbird decrypt message encrypted with key stored in Yubikey? How do you make the gpg-agent called by thunderbird?