If you receive an error similar to the below error, this article will help you in resolving it.

Secondary hostnames must differ error
This error means that the hostname that you are trying to add the SSL is already under your custom hostname list.

To fix that error, we will need to
Click on Manage button next to your pull zone
Navigate to the Hostnames section on the left navigation tabs
Click remove next to the hostname that you require adding the SSL

Remove hostname that required SSL enabled

Once it's removed, re-try adding the SSL certificate
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