This is just a hosted version of the open source python-vipaccess tool, since it can be a pain to set up.
I originally made this page for PayPal, although it finally supports normal TOTP nowadays, people apparently still find it useful for other services.
Since this is all about security, you should run it yourself if you don't trust me, but I promise I'm not storing anything. You can check out my code here.
You can enter anything here, it's just what gets displayed in your TOTP app. I'd recommend using your relevant email address and the name of the service.