Ios build unable to conncet to playfab servers made on windoes

Hi, guys i have a game which is supposed to run cross platform. I have servers made in windows using playfab. the servers are working just fine but when i try to play my game on ios and try to join the game i get an error that “it is unable to connect because of version differenece” where as both the builds are on source 5.3.2 version of unreal engine.