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 can also reproduce the issue, i.e. "Failed to activate certificates." a few seconds after clicking "Enable managed security" with 4 domains checked.

I checked the DNS records and the CNAME, A, AAAA records of all the domains match exactly what is shown on the admin console.

Can you try using gcloud? There may be a UI problem.

Thanks, it worked fine with the gcloud command.

We've found the glitch in the UI and the issue will be resolved shortly. Thanks for all the support and quick testing after announcing this beta release.

Happy to report everything is working as expected, go get those managed certs!

I was able to reproduce the problem through the UI. I was able to get it working by using the gcloud CLI instead.

I also could not get it to work on two separate domains. Everything seems fine, and I was able to renew the certs with LE just now.

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.

Seems to be working fine now.

Thanks for the quick response! I'll double check them later today.

I was able to get this to work in the command line (after gcloud components update). This is an exciting feature!

Thanks for the support! And thanks for all the good work on AppEngine!

And thanks to other commenters too!

Any chance that you will support wildcard domain names?