az network private-endpoint-connection approve / reject tries to send PUT request with read only properties

[hivyas]

Is your feature request related to a problem? Please describe.

When running az network private-endpoint-connection approve --id private-connection-id I get the following error:

Bad Request({
"error": {
"code": "InvalidResource",
"message": "Property set method not found."
}
})

Describe the solution you'd like

Describe alternatives you've considered

Currently can only use Azure Portal to approve and reject connections.
Additional context

[yonzhan]

network