I had to disable MFA for NordVPN and then re-enable it to generate a new QR code. I then used snip to capture a .jpg of it and saved it in an encrypted vault in case I need it in the future (for new devices or reinstalls). I don't remember getting new NordVPN backup codes this time, 1Password doesn't use them. I just got 1Password today so I haven't had a chance to see how 1PW fills in the codes (but the codes show in the NordVPN entry). Nor have I had a chance to check if reports of NordVPN interferring with 1PW are a problem for me.