Who is generating an edgesuite.net error message

Three of our locations with Cogent Internet service are unable to access a web site. Three of our non-Cogent locations are able to access the site just fine. We get the error message below, and I don't know enough about this to tell if the issue is with Cogent, with a CDN, or with the web server. Can anyone offer insight? Here is the error we get: You don't have permission to access "http://waf-failover.macys.com/prod/WAF_Failover/WAF_error_page.html?" on this server. Reference #18.5ebc7768.1747925785.aafdbd3 https://errors.edgesuite.net/18.5ebc7768.1747925785.aafdbd3