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What can I do to get Steam account name in UE4 without using OnlineSubsystem Steam?

What can I do to get Steam account name in UE4 without using OnlineSubsystem Steam?

You can’t. If you aren’t using the Steam OnlineSubsystem then you can’t use the Steam API to ask the Steam client which Steam account is currently signed in.

The best you could do is ask the player to type in their Steam name and hope that they aren’t lying and using someone else’s Steam name.