Multiplayer works... except with two specific devices

[bullz.]

So today I was playing MHFU and trying to connect a real PSP to a SteamDeck running PPSSPP to no avail. I tried connecting the PSP to my laptop and it worked flawlessly, and I connected the SteamDeck to the laptop which also worked...

When trying to connect the PSP to the SteamDeck, the Gathering Hall appears empty on both games, but the Pro Online plugin on the PSP shows the user count as 2, and the 2 systems can even exchange messages through chat.

What could be the issue here? I appreciate any help you guys can provide.

Game:MHFU
Connection:all systems on the same network
Deck <-> laptop works
laptop <-> PSP works
Deck <-> PSP doesn't work