The EU Cloud Data Center migration for the Workflow service announced in
Zuora Will Migrate The Workflow Service For EU Tenants To EU Cloud Data Center is delayed until further notice.
Please continue to move off the deprecated endpoint (https://workflow.apps.zuora.com) as mentioned in the original post. This endpoint will be deprecated shortly in Sandbox, Central Sandbox, and Production.
Workflow scheduled downtime has been canceled and will be rescheduled to a later date.