Hello Adam and welcome to the community,
There used to be a scan QR to login
I am afraid that feature probably belongs to another password manager.
I can’t seem to login via a device
You can only use “Login with device” after you have successfully logged in with a password once. Without a password, you can’t set up “Login with device” for that new client.
there is no hint
If you have put in a password hint in the Bitwarden web vault in the past, you can “Get master password hint” (under the password entry field) emailed to you.
Failing that, mostly you need to jog your memory about your master password, or about where you might have written it down in the past.
This guide might help: