The most common errors users can receive, while trying to use this method are as
follows:
1. 403 - PERMISSIONS ISSUE
Check the Permissions of the service user’s token was that was generated
(In Settings > Roles & Permissions)
2. 401 - AUTHENTICATION ISSUE
Try to reproduce by using the same token as they are trying to receive a response with.
3. 400 - HTTP error.
a. Ensure that you used supported fields for the fieldpath (Supported fields: “root.id”, "root.email")
b. Ensure that you used supported operators (“equals”)
c. Ensure that you used The list of values to compare with the operator. An Empty list will result in 400 HTTP error.