You’ve not specified the namespace in your describe pod command.
You did kubectl get all -n minio-operator, which gets all resources in the minio-operator namespace, but your kubectl describe has no namespace, so it’s looking in the default namespace for a pod that isn’t there.
kubectl describe pod -n minio-operator <pod name>
Should work OK.
Most resources in kubernetes are namespaced, so will require the -n <namespace> argument unless you switch namespaces.