AoE 2 HD: Making allies over LAN games?

This might be a really stupid question, I've tried searching for it but didn't get any results which answered my query.

So I play AoE 2 with a friend against multiple AIs, we have "Lock Teams" turned off, but when we try and change our stance towards an AI nothing happens. In singleplayer when I turned some AI to an Ally it usually requests for some resources and then once the needs are met they'd change to ally.

But in multiplayer, when I change it to Ally nothing happens, it doesn't request for resources and it stays Enemy. I've even tried sending few hundred resources to see if it triggers anything, nothing happens.

So rather than spending time experimenting with this, I felt I'd be better off asking if it is possible at all to get an AI to change to Ally or neutral when in a multiplayer game?

PS: It works with human players, because we just need to switch the buttons on either user's side.