Netplay with player 2 active

Description

I have two arcade machinnes runing retroarch, but when i try to play in netplay the controls of the player two dont work.
I want to play 4 players game, but with this issue i only can play with one player on each arcade cabinet.
What can i do to play 4 players on the two arcades on netplay games?

Expected behavior

Solution to actuvate second control in each arcade.

Actual behavior

Actually the second player are inactive on netplay.

Steps to reproduce the bug

1. Connect two machinnes on netplay
2. Try to select a game for 4 players
3. Only two players can play

Bisect Results

[Try to bisect and tell us when this started happening]

Version/Commit

You can find this information under Information/System Information

• RetroArch: [version/commit]

Environment information

• OS: [The operating system you're running]
  Rgbpi-OS (raspberry)
• Compiler: [In case you are running local builds]

No source file, test, version, or commit is named. Start by reproducing the four-player netplay scenario with two Raspberry Pi arcade machines and record the RetroArch version and configuration; done means the second controller on each machine is active in the netplay game.