Rbx Codes For RBLX

So in the beginning is says to put in email so I did for my phone and it didn't work to sign in so I tried my roblox one and it didn't work I put the correst password and how do you get the codes I haven't gotten any and I put it at five stars so people can see this I think its a scam

So I tried typing a few codes to redeem them and every single one of them was invalid. I tried this 6 or 7 different times and nothing worked. This is a scam :( I only put this up at 5 stars so you can see my review!

So I’m writing this review because I don’t know how to get the codes developers. Please tell me how it works it is a good app it has my dream items I just wish it worked