@bradykelly Welcome to the forum!
In that case, when you opened the login screen on the Discord app, just choose Bitwarden’s “Autofill” quick-tile. I just tested it and it worked. (–> just follow the flow)
Alternative, you could also set up a passkey with Discord and choose “Log in with passkey”. That is even quicker.
PS: Especially if it still doesn’t work, then check your general setup of the Android app. We also have this community guide for that: [Short Guide / Tips] Autofill on Android