You need to make sure the last name on your Chexy account matches your Aeroplan account. This is the same as the name you used to verify your identity while signing up, and cannot be changed on the Chexy system.
To change the last name on your Aeroplan account, visit aeroplan.com. You’ll be asked to upload proof of identification as part of the name change process. This process will take about 2 weeks.
After that, try again. If you’re still having issues, reach out to Chexy Support