CNAME Zone Lockdown Rule

Is it possible to create Zone Lockdown rules for CNAMEs? We have subdomains pointing to Heroku apps. I am trying to restrict some subdomains to internal use.

I tried creating a Zone Lockdown rule with the domain names and our office IPs, but it does not work as they are still publicly accessible.

I guess it just took some time to take effect. Now it’s working. Thanks

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