Cannot delete Namespaces from Rancher cluster

Hello together,
I have a rke provisioned rancher cluster (local) running and a rancher provisioned cluster with workloads.
I am now trying to delete a namespace in the cluster and get the following error

I have openebs installed for pvc provisioning. However, in the namespace there is no pvc included. I also checked the certificates in both clusters, those are all valid till 2030. I can also create new namespaces create deployments and delete resources except a namespace. Can someone tell me how I can fix this? Thanks for your help

Error deleting
Internal error occurred: failed calling webhook “”: Post “https://admission-server-svc.openebs.svc:443/validate?timeout=5s”: x509: certificate has expired or is not yet valid: current time 2022-03-15T17:37:47Z is after 2021-12-26T18:24:28Z