We are trying to create a DCI that will read an Rest API json response for a value. We set up a web definition called "Test" with the api url, we added the authorization token and application/json headers. I set up the DCI according to the admin guide with "Test:/cellularBandwidth/values/total_usage" but the DCI returns <ERROR>. Here is an example of the json response:

{"cellularRssi":{"unit":"dBm","values":[{"name":"AT\u0026T","data":[{"timestamp":1616719359000,"value":"-27.0"},{"timestamp":1616721157000,"value":"-55.0"},{"timestamp":1616722951000,"value":"-48.0"},{"timestamp":1616724761000,"value":"-36.0"},{"timestamp":1616726556000,"value":"-45.0"},{"timestamp":1616728358000,"value":"-63.0"},{"timestamp":1616730161000,"value":"-52.0"},{"timestamp":1616731961000,"value":"-68.0"},{"timestamp":1616733762000,"value":"-32.0"},{"timestamp":1616735576000,"value":"-39.0"}]}]},"cellularBandwidth":{"unit":"MB","values":[{"name":"AT\u0026T","total_usage":"42.88 MB","data":[{"timestamp":1616722200000,"value":8.62},{"timestamp":1616725800000,"value":9.51},{"timestamp":1616729400000,"value":8.98},{"timestamp":1616733000000,"value":10.82},{"timestamp":1616736600000,"value":4.94}]}]}}

I think it's going to be something simple but I can't seem to find what we are doing wrong. Any help would be appreciated. Thank you!