How did you configure the custom domain and the SSL certificates, exactly? 
A step-by-step description would help a lot. Have you followed any 

After you set up your custom domain and update the DNS records, a managed 
SSL certificate is automatically provided within a few minutes. Have you 
verified that the SSL certificate has been actually provisioned? You can do 
that by running: 

gcloud beta app domain-mappings list

You should see a list of your domains, subdomains, and all their 
corresponding certificates, for example:

ID                               SSL_CERTIFICATE_ID             123456     234567

You can gather more relevant detail from the "Securing Custom Domains with 
SSL" documentation page 

Any other piece of information you deem relevant might prove of great help. 

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