Fulcrum asks for a 6-digit code from an authenticator app every time you sign in, and again if you ever reset your password. Install one on your phone before you continue.
Save your backup codes
After setup you are shown ten single-use backup codes, once. They are the only way in if you lose your phone. Store them somewhere other than that phone. If you lose both the app and the codes, we cannot recover the account for you.