Solved Platform Selection

[ItsMCB]

Greetings. My server allows for Java and Bedrock players to join, and this skript is aimed at giving them a permission group (through Luck Perms) that will help tailor their experience depending on what platform they are using. Note this will be for a lobby server that will affect the whole network.

Goal:
When a player joins, their previous choice will be cleared. A vanilla GUI will pop up prompting them to select their platform. If they try to close out of the menu without making a selection, it will open again. If they choose to make a selection, a Luck perms command will go through giving them the permissions globally. They can then run around and click on an NPC to join a game and do whatever.

Permission Nodes (Luck Perms Groups):
group.minecraftjava - Java Players
group.minecraftbedrockmobile - BE Players on their phone / tablet
group.minecraftbedrockconsole - BE players on Win 10 or console

The Problem:
The vanilla GUI is fine for now. The problem is getting those permissions cleared when a player joins and forcing players to select an option before they can play.

What I have so far:

# Platform Selection Moduel
on any movement:
    loop all players:
        if loop-player doesn't have permission "group.minecraftjava or group.minecraftbedrockmobile or group.minecraftbedrockconsole":
            make player execute command "/platform"
            send "Forcing you to select your platform!"
on join:
    loop all players:
        if {skverify::%loop-player%} is true:
            set {_skveryify} to false
            wait 1 tick
        if {skverify::%loop-player%} is not set:
            make console execute command "lp user %loop-player% parent remove minecraftjava"
            make console execute command "lp user %loop-player% parent remove minecraftbedrockmobile"
            make console execute command "lp user %loop-player% parent remove minecraftbedrockconsole"
            set {_skveryify} to true
            stop
        if {skverify::%loop-player%} is false:
            make console execute command "lp user %loop-player% parent remove minecraftjava"
            make console execute command "lp user %loop-player% parent remove minecraftbedrockmobile"
            make console execute command "lp user %loop-player% parent remove minecraftbedrockconsole"
            set {_skveryify} to true
            stop

# INVENTORY SELECTOR
command /platform:
    description: The best way of doing something.
    trigger:
        set metadata tag "platform" of player to chest inventory with 3 rows named "&bSelect Your Platform"
        set slot 4 of metadata tag "platform" of player to player's skull named "&6%player%" with lore "&7Please select your platform below."
        set slot 21 of metadata tag "platform" of player to flower pot named "&6Java Edition"
        set slot 22 of metadata tag "platform" of player to bedrock named "&6Windows 10/Console Edition"
        set slot 23 of metadata tag "platform" of player to bedrock named "&6Phone/Tablet Edition"
        open (metadata tag "platform" of player) to player
 
on inventory click:
    if event-inventory = (metadata tag "platform" of player):
        cancel event
        #cancel the clicking. This makes the Item unstealable
        if index of event-slot is 21:
            send "&7You have selected &bJava &7as your platform. Switch at any time with &b/platform&7."
            make console execute command "lp user %player% parent add minecraftjava"
            make console execute command "lp user %player% parent remove minecraftbedrockmobile"
            make console execute command "lp user %player% parent remove minecraftbedrockconsole"
            close player's inventory
        if index of event-slot is 22:
            send "&7You have selected &bBedrock for Mobile Devices &7as your platform. Switch at any time with &b/platform&7."
            make console execute command "lp user %player% parent remove minecraftjava"
            make console execute command "lp user %player% parent add minecraftbedrockmobile"
            make console execute command "lp user %player% parent remove minecraftbedrockconsole"
            close player's inventory
        if index of event-slot is 23:
            send "&7You have selected &bBedrock for Windows 10 and Consoles &7as your platform. Switch at any time with &b/platform&7."
            make console execute command "lp user %player% parent remove minecraftjava"
            make console execute command "lp user %player% parent remove minecraftbedrockmobile"
            make console execute command "lp user %player% parent add minecraftbedrockconsole"
            close player's inventory


        else if index of event-slot is 1:
            if event-click type is right mouse button:
                #check if the player right clicks the item
                set {_playerHead} to uncolored name of event-slot parsed as player
                give event-slot to player
                send "&6Player %player% has received a skull of you!" to {_playerHead}

Thank you for reading my post