Hello from the App Engine team. Could you double check that your DNS records are accurate? Everything is looking good on our end. Thanks for the feedback!
I checked the DNS records and the CNAME, A, AAAA records of all the domains match exactly what is shown on the admin console.
I believe all my DNS records look fine, and I have the domain ownership set correctly with GAE. Not sure what else I can change to get it working.
Thanks for the support! And thanks for all the good work on AppEngine!
And thanks to other commenters too!