Hi@"zanettin"
LastPass Authenticator should still be working as normal even if you have desktop selected as your device type. You can also keep the LastPass mobile app installed and use it for account recovery if you ever need it. Are you seeing an error if you try the Back Up now option in the LastPass Authenticator app?
@zanettinThank you for reporting back, I can see how that would cause some confusion. I will share this with our team.