My webhook is saying the https is forbidden. Is there a way around this?

I was wondering if there was a way to get this script working?

local url = "https://discordapp.com/api/webhooks/486285105581785089/EC7e13TNSN9LGyWhPHr2a0FXu-r6rNm1X2LcZytCb5aip5gKLzkI0iMepDQWGIJ7JbFw" 
local http = game:GetService("HttpService")

game.Players.PlayerAdded:Connect(function(Player)
    local HookData = {
        ['username'] = "SERVER",
        ['content'] = "**" .. Player.Name .. " has joined.**"
    }
    HookData = http:JSONEncode(HookData)
    http:PostAsync(url, HookData)
    Player.Chatted:connect(function(Message)
        if Player.leaderstats.Rank.Value == "The Founder" then
            return nil
        end
        local HookData = {
            ['username'] = "SERVER",
            ['content'] = "***" .. Player.Name .. ": " .. "***" .. Message
        }
        HookData = http:JSONEncode(HookData)
        http:PostAsync(url, HookData)
    end)
end)

game.Players.PlayerRemoving:Connect(function(Player)
    local HookData = {
        ['username'] = "SERVER",
        ['content'] = "**" .. Player.Name .. " has left.**"
    }
    HookData = http:JSONEncode(HookData)
    http:PostAsync(url, HookData)
end)