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 
document? 

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
example.com             123456
www.example.com     234567

You can gather more relevant detail from the "Securing Custom Domains with 
SSL" documentation page 
<https://cloud.google.com/appengine/docs/standard/python/securing-custom-domains-with-ssl>
. 

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

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