Minecraft ver. 1.21.1
Fabric ver. 0.16.5
Mod ver. 3.1.6 (downloaded from here)

The following config entry has been set:

#The type of image to use as the player icon in messages. Valid entries are: AVATAR, HEAD, BODY, COMBO
    playerAvatarType = "HEAD"

And yet when a player chats in-game, there is no icon in the correlated discord server showing that player's head. Everything else is working fine.

Please let me know if further information is required. Thank you.