A domain is in two Cloudflare accounts.
Current account (account B) just had the domain DNS verified (NS servers were changed from elliot.ns.Cloudflare rosa.ns.Cloudflare to adrian.ns.Cloudflare houston.ns.Cloudflare as instructed. But now the website shows this error
You’ve requested a page on a website (…com) that is on the Cloudflare network. Unfortunately, it is resolving to an IP address that is creating a conflict within Cloudflare’s system.
If you are the owner of this website:
you should [login to Cloudflare] and change the DNS A records for …com to resolve to a different IP address.