We have updated PlayFab SDK to v. 2.106.210406 and all of a sudden, if HttpWebRequest is used as request type, no callback is called on success. We identified the problem in:
PlayFabSDK/Shared/Internal/PlayFabHttp/PlayFabWebRequest.cs, line 254
if (localActiveRequests[i].HttpRequest.HaveResponse) <-- HaveResponse does not seem to work
we changed it to:
if (localActiveRequests[i].HttpRequest.GetResponse() != null) <-- it works!
I assume this is a bug, let me know if I am missing something.