Why is my remote function returning nil?

Hi everyone, quick question.

I'm basically sending out announcements in a game to all clients, but before doing so it individually matches the player's chat filtering settings.

I do this using a remote function to filter the chat in a server script, and then return the filtered text.

Here is my code?

Server Script:

local repStore = game:GetService("ReplicatedStorage")
local TextService = game:GetService("TextService")

function repStore.filterMsg.OnServerInvoke(player,msg)
    local success, errorMessage = pcall(function()
        return TextService:FilterStringAsync(msg, player.UserId):GetChatForUserAsync(player.UserId)
    end)
    if not success then
        warn("Error filtering text:", msg, ":", errorMessage)
        return
    end
end

Local Script:

repStore.sendAnnouncement.OnClientEvent:Connect(function(msg,timer) --this is a remote event that is used for when an admin sends the announcement
    msg = repStore.filterMsg:InvokeServer(msg)
    print(msg)
end)

Any suggestions would be much appreciated.