Comment 6 for bug 1950073

A workaround you can also try is removing your password manager record for Launchpad, which should clear the incorrectly-filled field, and then try logging in again to create a new record (please write your password down before removing the record!).

Another option is to go into the password manager and clear any auto-filled values for openid.usernamesecret (which is the bot detection field which should be left blank).