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Hi @janemicwork, I don’t show that domain as ever being active in your account, at least not the one that you are using here. You may be able to find details using the above, but typically “disappearing domains” are the result of the domain expiring and the name servers reverting to pre-cloudflare.
We’ve seen this reported a handful of times here and it’s usually caused by missing the warning emails we send that indicate the name servers changed away from cloudflare, that’s followed by the domain moving away from your account and eventually being purged by our system.
In this case, I cannot find any indication that happened with your domain. When did you add the domain to cloudflare?