Unable to add private vlan

I am trying to "convert" an existing DVS port-group to PVLAN. I change the existing portgroup to a different vlan during the change.

Then I go to the private vlan config under the DVS itself and try to add the primary pvlan.

I get the error below. I have tried different vlans, with and without community pvlans etc.

The vlan id value : 701 specified in spec.pvlanConfigSpec has already been added.

Any idea?