Is there a way to check if the player is online and in my game for cross server purposes?

Is it possible to check if a player is online, and in your game?

I've got a system, but it's not working the way I wanted it too.

local function savePlayerData(player)
    if sessionData[player] then
        return dataStoreRetry(function()
            return FriendData:SetAsync(player.userId, sessionData[player])
        end)
    end
end

local function setupPlayerData(player)
    local success, data = getPlayerData(player)
    if not success then
        sessionData[player] = false
    else
        if not data then
            sessionData[player] = {}
            savePlayerData(player)
        else
            sessionData[player] = data
        end
    end
end

function DataStore:UpdateStatus(player, isOnline)
    for i = 1, #sessionData[player] do
        local friendID = game.Players:GetUserIdFromNameAsync(sessionData[player][i]["Name"])
        if friendID ~= nil then
            output(player, ":", friendID)
        end

        local playerData = FriendData:GetAsync(friendID)

        if playerData ~= nil then
            for i2 = 1, #playerData do
                for i3 = 1, #playerData[i2] do
                    if playerData[i2][i3]["Name"] == player.Name then
                        playerData[i2][i3]["Online"] = isOnline
                    end
                end
            end

            FriendData:SetAsync(game.Players:GetUserIdFromNameAsync(sessionData[player][i]["Name"], playerData))
        end
    end
end

game.Players.PlayerAdded:connect(function(plr)
    setupPlayerData(plr)
    DataStore:UpdateStatus(plr, true)
end)

game.Players.PlayerRemoving:connect(function(plr)
    DataStore:UpdateStatus(plr, false)
    savePlayerData(plr)
end)