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Re:Managed SSL for Google App Engine by AnssiH on Thursday September 14, 2017 @01:29PM (#15250295)
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.

Re:Managed SSL for Google App Engine by mbwalas on Thursday September 14, 2017 @01:33PM (#15250340)
Can you try using gcloud? There may be a UI problem.
Re:Managed SSL for Google App Engine by AnssiH on Thursday September 14, 2017 @01:47PM (#15250523)
Thanks, it worked fine with the gcloud command.
Re:Managed SSL for Google App Engine by lklig on Thursday September 14, 2017 @06:53PM (#15253150)
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.
Re:Managed SSL for Google App Engine by lklig on Friday September 15, 2017 @12:01PM (#15258204)
Happy to report everything is working as expected, go get those managed certs!
Re:Managed SSL for Google App Engine by adeanzan on Thursday September 14, 2017 @01:39PM (#15250412)
I was able to reproduce the problem through the UI. I was able to get it working by using the gcloud CLI instead.