Of course But this is an incorrect 524 error being issued by Cloudflare. Everything the guide says confirms that, since a 524 error can only occur when the origin server does not respond within 100 seconds. To check the origin server, I simply disabled Cloudflare. The URL is loading fine now. There were no timeouts on my origin server.
I will resume Cloudflare in a few hours to see if the error persists.