Automated Alerting identified that there was an issue with inbound traffic routing for MOVEit Cloud Wildcard URLS (*.moveitcloud.com & *.moveitcloud.eu), while custom URL routing was unaffected.
Investigation found that an IDS processes responsible for automatically locking out IP addresses that trigger an IDS response had effectively created a DENY ALL rule for inbound traffic to MOVEit Cloud Wildcard URLS.
This change has been reverted and normal service has been restored.