Gamepass is not a gamepass? O.o

I'm developing a simple game which currently has one gamepass. For some reason if a player has the gamepass it doesn't work. Here's what the output says:

20:08:58.065 - GamePassId '4447283' is not of type Game Pass. Please use MarketplaceService:PlayerOwnsAsset instead. (x2)

This item is clearly a gamepass but the output always says it's not. Interestingly enough, the buy screen appears when PromptGamePassPurchase is called even though it causes output to say the same thing above.

Here is the script of a remote function if it'll help

local GamePassService = game:GetService('GamePassService')

function script.Parent.OnServerInvoke(plr, id)
    if GamePassService:PlayerHasPass(plr, id) then
        return true
    else        
        return false
    end
end