How to add a pixel as a product source?

Question

Facebook

Good evening!
The second day trying to fix the problem with pixel.
The pixel itself is configured on the site. The schema.org markup is set up correctly (at least not when viewed through facebook's error checking tool).
But the problem is that when I try to connect this pixel to the catalog as a source of goods, it is gray and you cannot select it (Writes that it is not ready. Although there are no errors in the scheme through error checking).
Maybe someone faced such a problem?
It doesn't give any errors anywhere.