Greetings! 
I am sorry to hear that, but, using eZoic I am afraid they manage that and also disable all the cache on the Cloudflare side (at least due to their delivery of the ads) - even that was a case on my WordPress website too + the same error for a Page Rule which have hade Cache Level: set to Cache Everything.
Sharing below post, if it could provide some helpful information, at least a bit if that is the case:
Kindly, may I ask have you used eZoic integration?
Meaning, any change you make, you have to do it using eZoic interface - not the Cloudflare dashboard.
Usually, Page Rules can be found after you log into the Cloudflare Dashboard using your Cloudflare account, under the Rules tab → Page Rules:
