I can't control with player 3 in online multitap games

RetroArch Windows devices
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#1

I’ve been trying to play with my friends the game Super Bomberman 5 in our Windows 10 RetroArch. We can definitely play with 2 controllers. The problem is when we try to use multitap on controler 2 so controller 3 can join us. The multitap works, we can now effectively activate players 3, 4 and 5. The second player can move the cursor and select it’s character but the 3rd player can’t do a single thing. It enters the session, but it can’t move the cursor or change it’s character.

Can anyone show some steps to make multitap work with online?

#2

Which core are you using? Have you tried any others?

#3

We’ve been using Snes9x (current).

Tried other versions but were hit with the same problem or worse.