APIv4 GroupContact create indicates user is added but are not
I came across a strange issue whereby in APIv4 I was attempting to add users to a group (a static one not a smart group). Essentially, upon doing so it was indicating that the users were properly added but they aren't. I reverted the code to use the APIv3 version of creating a contact within a Group and that did work!
For the record, the delete functionality of APIv4 is functioning properly.