May I know are your fingerprint enrolled by administrator account already?
I think the problem what you met is because your fingerprint is not enrolled by administrator account, or maybe forgot which fingerprint is enrolled by administrator account, so you can’t log-in the application from AH650.
Please reference by AH650 user manual page.9.
Firstable you have to access one of administrator user’s fingerprint, then asked administrator to let you replaced one of adminisrator’s account.
Trying to use new fingerprint for administrator account, I think that can resolve your problem.
Thank you.