Hey there,
whenever I try to use the /give @p minecraft:player_head{skullowner:USERNAME} command, the command block output says "Unknown item name" which doesn't happen without EssentialsX.
Version: 1.14.4

/give is overridden in EssentialsX. If you want to use the vanilla /give syntax, you have two options:

• Add - "give" to the command-block-overrides in commands.yml (makes command blocks always use the Mojang version of the command)
• Change every command block to use minecraft:give instead of give

You can also use the Essentials syntax for giving skulls: /give @p player_head 1 owner:GreenBulldog22, but you might need to install a plugin like PsudoCommands before command selectors work.

its got to be /give @p minecraft:player_head{SkullOwner:"GreenBulldog22"}