We own d1 . org and d2 . org (real domain name substituted), both use Cloudflare DNS with proxy enabled (d1 - paid plan, d2 - free plan).
Each of these domains, point to distinct S3 storage buckets with another provider. Everything worked fine for the past year or so. But recently, Cloudflare started reporting 1014 - CNAME Cross-User error for d2, without any change on our side. d1 continues to work with similar DNS record setup as d2.
We don’t have CNAME records going to the same URL from our different domains. So, not sure why the sudden 1014s. Any idea what could have changed and how to troubleshoot?