I'm going to guess you just got one from Docker Hub today, because I did too. I saved the code, alongside the password in my password manager, which itself already requires 2FA to open. Still, seems like it defeats some of the point of the security to store it in the same place as the password...
It's no longer a second factor when stored along with the password. I just write them down in a notebook with the name of the service (no usernames etc).