Gamepass Abilities Stop Whenever Player Dies??

as racoon said but made it easier

the plr value will update each time someone joins so that way is not reliable instead do this make a local script in the players backpack or startercharacter, really doesnt matter in the local script you do this

--also when finishing the promt purchase, fire that to the server, let the server handle that sort of stuff
MPS.PromptGamePassPurchaseFinished:Connect(function(plr,ido,purchased)
    if purchased and SpeedX2_ID == ido then
            plr.Character.Humanoid.WalkSpeed.Value = plr.Character.Humanoid.WalkSpeed.Value * 2
    end
end)


local player = game:GetService("Players").LocalPlayer
player.CharacterAdded:Connect(function()
--you also need a remove event for this to work
game:GetService("ReplicatedStorage"):WaitForChild("Remove event name here"):FireServer("Speed")--speed is just a variable you wanna fire to the server, can be literally anything as long as the server looks for that variable
end)

make a server script in serverscriptservice and add this into that script

local MPS = game:GetService("MarketplaceService")
local SpeedX2_ID = 8291824
game:GetService("ReplicatedStorage"):WaitForChild("remote event name here").OnServerEvent:Connect(function(player,word)
    if word == "Speed" and MPS:UserOwnsGamePassAsync(plr.UserId,SpeedX2_ID) then--this is where you use the variable from the local script
local humanoid = plr.Character:WaitForChild("Humanoid")
humanoid.Speed = humanoid.Speed * 2
end)

Speed resets whenever a player dies. You'd need to have a CharacterAdded function. Example:

function Respawned(player)
    local plr = game.Players:FindFirstChild(player.Name)
        if MPS:UserOwnsGamePassAsync(plr.UserId,SpeedX2_ID) then
            game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed = game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed * 2
    end
end

local MPS = game:GetService("MarketplaceService")
local players = game:GetService("Players")
local SpeedX2_ID = 8291824

MPS.PromptGamePassPurchaseFinished:Connect(function(plr,ido,purchased)
    if purchased and SpeedX2_ID == ido then
            plr.Character.Humanoid.WalkSpeed.Value = plr.Character.Humanoid.WalkSpeed.Value * 2
    end
end)


game.Players.PlayerAdded:Connect(function(plr)
    if MPS:UserOwnsGamePassAsync(plr.UserId,SpeedX2_ID) then
            game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed =          game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed * 2
    end
    plr.Character:FindFirstChild("Humanoid").Died:Connect(function()
wait(6)
        if MPS:UserOwnsGamePassAsync(plr.UserId,SpeedX2_ID) then
            game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed = game.Workspace:WaitForChild(plr.Name):WaitForChild("Humanoid").WalkSpeed * 2
    end
    end
end)

The only change I made is when the player dies, it checks again and gives them their speed