Get security rule violation when saving configuration

When I put in my facebook app ID and Secret. Then I save and get the following message.

The page you are trying to access is restricted due to a security rule.

If you believe the security rule is affecting the normal operation of your website, contact your host support team and provide detailed instructions how to recreate this error.
They will be able to assist you with rectifying the problem and adjusting the security configuration if needed.

I contacted hosting support but they think you can help.

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