Thank you for also reporting this in the Public Issue Tracker <https://issuetracker.google.com/67916413>. Our engineering team is investigating possible solutions to working with Cloudflare's Origin CA <https://blog.cloudflare.com/cloudflare-ca-encryption-origin/> in order to perform domain verification. I have made the engineering team aware of your issue report <https://issuetracker.google.com/67916413>, and all further communications and updates concerning this issue will occur there.
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