Can't Update User Profile Field with HTTP REST API

I've seen several posts on this but most of them were using either C# or Velocity. I am simply using a REST Client (Insomnia) to try to test out some of the APIs. I am simply trying to update my Profile Field using the User REST API.

When I am using the REST client, I can update things like DisplayName and ApprovedStatus, but it is not updating the Profile Fields.

My data body is simply referring to the profile field:

Yet you can see the response that the Profile Field is not updating.

However, if I curl the same command, it will update

curl -s -k -H "Rest-User-Token: <Token>" -H "Rest-Method: PUT" -d "ApprovedStatus=Approved&DisplayName=Jerry Marchand&_ProfileFields_City=Curlcity" http://<site>/api.ashx/v2/users/jerry.json

What am I doing wrong in my REST client?