JSON API Service findReviews does not work as intended

I am trying to gather all of the reviews by a single group using ReviewService.findReviews with a python request. I try to use the arguments in the json "findPlace"="3", "customFieldName"="group", & "searchText"="<group name I am searching for>". I do not receive any responses if I change the customFieldName to "group", "Group", "GROUP".

Am I doing something incorrectly or is there any other way I can obtain the same outcome?