Deactivating the Supervisor in vSphere with Tanzu shows the task is stuck with the message "Waiting for workloads in the Supervisor to be deleted".
vCenter 8.0.3
vSphere with Tanzu
On the vCenter in /var/log/vmware/eam/eam.log you may see the following error:
Supervisor control plane failed: No connectivity to API Master: connectivity ok, config status REMOVING
Reboot the vCenter
If rebooting the vCenter does not resolve the issue, check this KB: WCP Supervisor Cluster stuck in "Removing" showing EAM errors