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