When the button is clicked, it doesn't function at all?

The issue is, the thing wont even function at all when i click it. Basically what i'm trying to make is a "Contest" system. If you click the button, it will put your username in the table and change the "Participants:" text and will add your username in it too. It doesn't send errors or anything, it just doesn't function. Please fix, would be appreciated.

local ParticipantSign = game.Workspace.Participants.SurfaceGui.Text
local DatastoreService = game:GetService("DataStoreService")

local Participants = DatastoreService:GetDataStore("Participants")
local ParticipantsTable = {}

function OnClicked(player)
    for i, v in pairs(ParticipantsTable) do
        if v == player.Name then
            print(ParticipantsTable.." nah you're in it")
            return
        else
            Participants:GetAsync(player.Name)
            table.insert(ParticipantsTable, player.Name)
            print(ParticipantsTable.. " yes it worked")
            ParticipantSign.Text = ParticipantSign.Text..player.Name..", "
        end
    end
end

script.Parent.ClickDetector.MouseClick:Connect(OnClicked)