I was half successful in deploying wvd so I want to delete my hostpool and start the deployment again. But I can't delete my hostpool cause I still have a sessionhost in it (the vm is not there anymore). When I try the powershell command Remove-RdsSessionHost with the force parameter I get the error from the subject. When I use the management website i get a general error message that I can't delete the host.
I used a Service Principal Name to deploy. I also created a new Service Principal, logged into the wvd environment but that gave the same error message. All accounts I tried it with are RDS Owner and RDS Contributor.