You will find the following message in the log when you set the following filters:

Your variants can be searched either with the EAN or with the variant ID.
 

The message indicates that at the time the offer was created, no product yet existed at Kaufland. This can, for example, also be related to Kaufland still processing this data.

Due to the check of whether a product is present, the creation of a product and the offer sometimes takes 2 working days.
On the first night, we check whether the product is present. If it has not even been sent to Kaufland yet, we output the error "Product not found". After that, the product is created. On the following night, the offer is then created based on the product.