CDN warning

I got this message from my newsletter plugin:

The WP scheduler doesn’t seem to be running correctly for the Newsletter

CDN warning

If you have a CDN active (for example Cloudflare), the service could cache the calls to wp-cron.php totally blocking the WordPress scheduler. Please, be sure to add an exception for this file in your CDN configuration (or ask the provider to add it for you).

How to handle it?

A post was merged into an existing topic: The scheduled event has failed