Change the role of a User in OGG MS 12.3

Hello

I have 2 users created with Role = User in my GG MS 12.3 deployment.

I am hoping to change their role to "Operator".  Hoping not to drop the existing account and create a new user.

So, tried running Curl script but am getting an error.  Can only passwords be modified this way?

curl -u oggid:password -H “Content-Type:application/json” -H “Accept:application/json” -X PATCH http://hostname:7849/services/v2/authorizations/user/uuserid1 -d '{"role":"Operator"}' | python -mjson.tool

I get the following response - I could not find any description for error code OGG-12108....is it even possible to change the role of an existing user?