You can create another GCKey User ID with the same email address until you get it right.
Please try this combination, didn't work for me but this has helped others:
Not mine. Credit goes to the owner.
"1. Logged in with GC Key account.
2. Permanent Residence > Family Class (Spouses)
2. Application Number and Family Name - Copy/pasted application number from email (including the F) and entered PA's last name. If you don't have App Number, use Family Name, Birthday, Place of Birth
3. City of Birth - I entered 1 space (hit spacebar once)
4. Country of Birth - Selected PA's country of birth
5. Passport Info - Did not enter any passport info
6. Other Application Info - Filled out the other application info as per our application and put '2' as the number of members in the application."
Good luck!