Nintendo Switch Pro Controller Not Detected Properly When Client Connects To Host

[Green Space Dorito]

When hosting a Steam Remote Play Together session, if a client is connected and using a Switch Pro Controller, the controller will not be properly detected. This does not matter if the controller is connected via the official USB cable or through bluetooth.

This makes it impossible for a client to participate in the game.The icon below the user's avatar displaying their input method will be blank. The UI prompt instructing the user to press a button to open the remote session menu will show a generic controller icon but will still function by letting you open and close the menu.

On some occasions, the client will also be told "Make sure you have a controller!" despite the controller being connected. Pressing any button will do nothing. Reconnecting the controller will sometimes fix that specific problem but then go back to the previous one.

This was tested using an official Nintendo Switch Pro Controller as well as a licensed third party pro controller between three different PCs and a Mac as well as three different Steam accounts. Both controllers were properly detected as "Nintendo Switch Pro" in the steam controller settings and work in non-remote play environments. Using Steam Input changes nothing.