Namespace delete in RKE-provisioned k8s "hangs forever"


I have an RKE-provisioned k8s cluster using CentOS7-1810 as the OS platform using the “v1.14.3-rancher-1” k8s version. Everythings seems to work fine and I’m able to add the new cluster to the v2.2.1 Rancher UI. However, as soon as I try to remove a namespace the remove command “hangs forever”. Is this a known issue? Furthermore, how is it possible to activate the “project isolation” feature when using RKE?