I'm trying to create a command block based kit pvp type thing in my friends' realm so that we can do kit pvp and select classes by just selecting a class.  I'm trying to use chain command blocks to link all the commands that are needed for one class to give someone all of the items.  When I try and run chain command blocks, the first impulse command block works, the chain command block that it's running into works, but the chain command blocks after that don't work at all.  I don't know if I'm using it wrong but this is the command chain I have setup

 

execute if entity @a[scores=\{footsoldier=1}] run give @a[scores=\{footsoldier=1}] minecraft:iron_helmet{Unbreakable:1}

 

that command works and runs into

 

execute if entity @a[scores={footsoldier=1}, nbt={Inventory:[

{id:"minecraft:iron_helmet"}

]}] run give @a[scores=\{footsoldier=1}] minecraft:iron_chestplate{Unbreakable:1}

 

that command works and is supposed to run into

 

execute if entity @a[scores={footsoldier=1}, nbt={Inventory:[

{id:"minecraft:iron_helmet"}

,{id:"minecraft:iron_chestplate"}]}] run give @a[scores=\{footsoldier=1}] minecraft:chainmail_leggings{Unbreakable:1}

 

but this command doesn't run.

 

Again, I don't know if I'm using the command blocks wrong but I've used chain command blocks in 1.12 and this should work.