524 from specific locations and working fine on others

[domjh]

Have you checked this out?

Community Tip - Fixing Error 524: A timeout occurred

Error Try the suggestions in this Community Tip to help you fix Error 524: A timeout occurred. Background Error 524 error indicates that Cloudflare made a successful TCP connection to the origin web server, but the origin did not reply with an HTTP response before the connection timed out. Typically, Cloudflare waits 100 seconds for an HTTP response. If the origin doesn’t respond in that time, Cloudflare closes the connection and you’ll see “Error 524: A timeout occurred”. [PRO UP SELL] Qui…

Sounds odd that it depends on location. Are the Cloudflare IPs allowlisted on the server?