Facebook error message: Access denied [website] used Cloudflare to restrict access

When I set up firewall rules to strict access to websites on Cloudflare to have visitors from only certain countries, then when I post links to them on Facebook I get the error message shown in the screenshot below. Does anyone know how we can retain those firewall rules and at the same time avoid getting this error message?

Here is a screenshot of the firewall rule that we are using:

Does anything show up in the Firewall Event Logs? Hopefully that will provide a clue.

Where are the firewall event logs? The page shown below?

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