Logging into Game Center and Google Play

I am trying to get google play and game center login screens to pop up. I am using the “Show External UI” node in blueprints the same way I did back in 4.16. My question really is do I need to change anything in the .ini files or anything? Some of the older information I have found said to change the defaultplatform to IOS but this lead to my build not working in itunes connect. I’m kinda lost here.

I had to make the following changes to the .ini file: DefaultPlatformService=MCP to DefaultPlatformService=IOS