For B&H, you will need to input two codes in order to monetize - your BI and KBID numbers. Once signed in, you can enter those numbers into your profile here and they will automatically wrap your B&H affiliate code to any B&H products that you add to your kits.
To check if your B&H links are working properly, find a B&H product in one of your kits and hover over the 'view on BH' button or copy the link address to get the raw link. You should be able to see both your BI and KBID numbers within that link. See the image below as an example