The pre-defined default tenant alias cannot be deleted.

A tenant alias associated with an account cannot be deleted.

To delete the EdgeRuntime_EdgeRuntimeName tenant alias created for an Integration Server acting as webMethods Edge Runtime, IBM recommends using Integration Mesh to deregister the Edge Runtime. Deregistering the Edge Runtime deletes the tenant alias and any EdgeRuntime accounts. If the Edge Runtime is not available when it is deregistered from Integration Mesh, use Integration Server Administrator to disable and delete the accounts associated with the EdgeRuntime_EdgeRuntimeName tenant alias and then delete the tenant.