Initialization failed

Hi. I want to insert iap into the game, made everything according to the instruction, then I start the game, but the app writes

can make payments: True
initializationFailed: [“”]

And the button of purchase doesn’t work. I checked bundleId, and it’s “” in Unity and in app settings on apple portal.
How can I solve this?

Hi, please see answers to other questions related to IAP:

Hope one of these help.