If your GCALS O-Key needs correcting:
Go to: https://gcals.gdc.ga.gov/ select the Account tab; click Profile - to modify your information.
Verify that your Officer Key (Okey) is correct - with the first digit as the letter "O" and not the number Zero "0"
You need to verify that your name, birthday, and O-Key match what is on your record at GaPOST.
If you cannot be verified after this, you may contact GPSTC using this email address: registrar@gpstc.org