Script doesn't work in studio but works fine in both local and normal servers?

You guys probably know the problem that scripts work in studio, but not in game (FE problems). It could be the same problem but I doubt that... I tried to restart studio and still the same problem, it doesn't give an error!.

EDIT: I think it's because the script is too long and the player joins before the playeradded event is loaded but I'm not sure.

The code that is failing is a playeradded event

game.Players.PlayerAdded:connect(function(player)
    print('ADDED PLAYER')
    for index, admin in pairs(Admins) do
        if admin == player.Name then
            print(player.Name..' is an admin')
            player.Chatted:Connect(function(Message)
                print('admin '..player.Name..' chatted this message: '..Message)
                if Command(Message) then
                    local MsgWords = decrypt(Message)
                    FireCmd(MsgWords, player)
                end
            end)
        end
    end

    UpdateBanlist()
    for index, ban in pairs(BanList) do
        if ban == player.UserId then
            warn(ban..player.Name)
            player:Kick('You have been banned from this game!')
        end
    end
end)

There is a lot more code but it just doesn't print 'ADDED PLAYER' (it doesn't run any code inside the playeradded event).

I searched for it online but I don't think people had the exact same issue, I don't know if this is a script issue or a studio bug.

This is the whole script

local DataNum = 0
local DataStore = game:GetService('DataStoreService')
local BanStore = DataStore:GetDataStore('BanStore_'..DataNum)
local BanNameStore = DataStore:GetDataStore('BanNameStore_'..DataNum)

print('script running')

local ChatEvent = game:GetService('ReplicatedStorage'):WaitForChild('Chat')

local GlobalKey = 1000

local Admins = {'RedcommanderV2', 'BANSA168', 'Player1'} -- Remove Player1
local DecryptionPatterns = {
    ['Default'] = '%S+'
}

local Prefix = '/'

Words = {}
Reason = {}

BanList = {}
BanNameList = {}

function Command(Msg)
    local MsgPrefix = string.sub(Msg,1,1)
    if MsgPrefix == Prefix then
        return true
    else
        return false
    end
end

function decrypt(sentence)
    Words = {}
    for word in string.gmatch(sentence, DecryptionPatterns.Default) do
        table.insert(Words, word)
    end
    return Words
end

function FindTarget(PlrName)
    if PlrName == nil then
        return nil
    end
    if PlrName == 'Everyone' then
        return 'Everyone'
    end
    for index, plr in pairs(game.Players:GetPlayers()) do
        if plr.Name == PlrName then
            return plr
        end
    end
    for index, plr in pairs(game.Players:GetPlayers()) do
        if plr.Name:lower():sub(1,PlrName:len()) == PlrName:lower() then
            return plr
        end
    end

    return nil
end

print('script still running')

function FindTargetId(PlrName)
    if PlrName == 'Everyone' then
        return 'Everyone'
    end

    playerID = nil
    warn('We\'re using FindTargetId so you have to give the full name!')
    local success, message = pcall(function()
        playerID = game.Players:GetUserIdFromNameAsync(PlrName)
    end)

    print(PlrName..' has playerID '..playerID)  

    if success then
        return playerID
    else
        return nil
    end
end

function UpdateBanlist()
    BanList = {}
    BanNameList = {}
    local Bans = BanStore:GetAsync(GlobalKey) or {}
    local Names = BanStore:GetAsync(GlobalKey) or {}

    for index, ban in pairs(Bans) do
        table.insert(BanList, ban)
    end

    for index, name in pairs(Names) do
        table.insert(BanNameList, name)
    end
end

UpdateBanlist()
print('script STILL RUNNING')

local function FindReason(MsgWords, StartNumber)
    Reason = {}
    for index, word in pairs(MsgWords) do
        if index >= StartNumber then
            table.insert(Reason, word)
        end
    end
    return(table.concat(Reason, ' '))
end

function SetCmd(MsgWords, plr)
    local Cmd = MsgWords[1]
    local Target = FindTarget(MsgWords[2]) or plr
    local Value = MsgWords[3] or 'Gold'
    local Amount = MsgWords[4] or 1000

    if Target ~= 'Everyone' then
        local leaderstats = Target:WaitForChild('leaderstats')
        for index, stat in pairs(leaderstats:GetChildren()) do
            if stat.Name == Value then
                stat.Value = Amount
            end
        end
    else
        for index, player in pairs(game.Players:GetPlayers()) do
            local leaderstats = player:WaitForChild('leaderstats')
            for index, stat in pairs(leaderstats:GetChildren()) do
                if stat.Name == Value then
                    stat.Value = Amount
                end
            end
        end
    end
end

print('reached line 138')

function GiveCmd(MsgWords, plr)
    local Cmd = MsgWords[1]
    local Target = FindTarget(MsgWords[2]) or plr
    local Value = MsgWords[3] or 'Gold'
    local Amount = MsgWords[4] or 1000

    if Target ~= 'Everyone' then
        local leaderstats = Target:WaitForChild('leaderstats')
        for index, stat in pairs(leaderstats:GetChildren()) do
            if stat.Name == Value then
                stat.Value = stat.Value + Amount
            end
        end
    else
        for index, player in pairs(game.Players:GetPlayers()) do
            local leaderstats = player:WaitForChild('leaderstats')
            for index, stat in pairs(leaderstats:GetChildren()) do
                if stat.Name == Value then
                    stat.Value = stat.Value + Amount
                end
            end
        end
    end
end

function KickCmd(MsgWords, plr)
    local Cmd = MsgWords[1]
    local Target = FindTarget(MsgWords[2]) or plr
    local Reason = FindReason(MsgWords,3) or ''

    if Target ~= 'Everyone' then
        Target:Kick(plr.Name..' has kicked you because '..Reason)
    end
end

function BanCmd(MsgWords, plr)
    local Cmd = MsgWords[1]
    local Target = FindTarget(MsgWords[2]) or plr
    local Reason = FindReason(MsgWords,3) or ''

    if Target ~= 'Everyone' then
        warn('Banning '..Target.Name)

        if Target.Name == plr.Name then
            warn('Ban failed because the player you are trying to ban is yourself')
        else
            local TargetKey = Target.UserId
            local Bans = BanStore:GetAsync(GlobalKey) or {}
            local Names = BanNameStore:GetAsync(GlobalKey) or {}

            BanList = {}
            BanNameList = {}

            for index, ban in pairs(Bans) do
                table.insert(BanList, ban)
            end

            for index, name in pairs(Names) do
                table.insert(BanNameList, name)
            end

            table.insert(BanList, TargetKey)
            table.insert(BanNameList, TargetKey)

            BanNameList[TargetKey] = Target.Name

            local success, message = pcall(function()
                BanStore:SetAsync(GlobalKey, BanList)
                BanNameStore:SetAsync(GlobalKey, BanNameList)
            end)

            Target:Kick('You have been banned by '..plr.Name..' because '..Reason)
        end

    else
        warn('You cannot ban everyone!')
    end
end

print('reached line 219')

function UnbanCmd(MsgWords, plr)
    local Cmd = MsgWords[1]
    local Target = FindTargetId(MsgWords[2]) or nil

    if Target and Target ~= 'Everyone' then
        warn('unbanning '..Target)
        local TargetKey = Target
        local Bans = BanStore:GetAsync(GlobalKey) or {}
        local Names = BanNameStore:GetAsync(GlobalKey) or {}

        BanList = {}

        for index, ban in pairs(Bans) do
            table.insert(BanList, ban)
        end

        for index, ban in pairs(Bans) do
            if ban == TargetKey then
                table.remove(BanList, index)
            end
        end
        for index, name in pairs(Names) do
            table.insert(BanNameList, name)
        end
        BanNameList[TargetKey] = nil

        for index, name in pairs(BanNameList) do
            if name == TargetKey then
                table.remove(BanNameList, index)
            end
        end

        print(BanList)

        for index, ban in pairs(BanList) do
            print(ban)
        end
        for index, name in pairs(BanNameList) do
            print(name)
        end
        local success, message = pcall(function()
            BanStore:SetAsync(GlobalKey, BanList)
        end)
    elseif Target and Target == 'Everyone' then
        BanList = {}

        local success, message = pcall(function()
            BanStore:SetAsync(GlobalKey, BanList)
            BanNameStore:SetAsync(GlobalKey, BanNameList)
        end)
    end
end

function ListCmd(MsgWords, plr)
    UpdateBanlist()

    ChatEvent:FireClient(plr, MsgWords, Color3.new(1,1,1))
    print('fired')
end

function FireCmd(MsgWords, plr)
    if MsgWords[1] == '/set' then
        SetCmd(MsgWords, plr)

    elseif MsgWords[1] == '/give' then
        GiveCmd(MsgWords, plr)

    elseif MsgWords[1] == '/kick' then
        KickCmd(MsgWords, plr)

    elseif MsgWords[1] == '/ban' then
        BanCmd(MsgWords, plr)       

    elseif MsgWords[1] == '/unban' then
        UnbanCmd(MsgWords, plr)     

    elseif MsgWords[1] == '/list' then
        ListCmd(MsgWords, plr)

    else
        warn('eror!')
    end
end

print('reached line 305')

game.Players.PlayerAdded:connect(function(player)
    print('ADDED PLAYER')
    for index, admin in pairs(Admins) do
        if admin == player.Name then
            print(player.Name..' is an admin')
            player.Chatted:Connect(function(Message)
                print('admin '..player.Name..' chatted this message: '..Message)
                if Command(Message) then
                    local MsgWords = decrypt(Message)
                    FireCmd(MsgWords, player)
                end
            end)
        end
    end

    UpdateBanlist()
    for index, ban in pairs(BanList) do
        if ban == player.UserId then
            warn(ban..player.Name)
            player:Kick('You have been banned from this game!')
        end
    end
end)

print('finished')