Can't fix "Encryption Credentials Have Expired" for an HP printer

I'm struggling with the configuration of an HP Envy 7920e on MacOS 13.5. I added the printer but if I use the default driver (HP ENVY Inspire 7900 series-AirPrint 3.0), I get the error "Encryption Credentials Have Expired". I've already tried to renew the certificate (that's valid, by the way) and to re add the printer many times (see here: https://superuser.com/questions/1761248/encryption-credentials-have-expired-when-trying-to-print-to-network-printer-on-m) , but such an error persists. EDIT: I tried to download the certificate from the web interface of the printer manually, but then I can't add it to my keychain (I get Error: -25294)