The requested sku is not assigned to given stock. Product is not displayed

Question

When I go to product page I get this: The requested sku is not assigned to given stock.

Also product is not displayed on category page.

Answer 1

I figured it out right after posting here.

On product listing check products and in the action menu select to assign to sources.

EDIT

just to make it a bit clearer;

Backend -> product grid -> select the products and from the "Actions" drop-down on top of the products grid select "Assign Inventory Source" ;)

Answer 2

My problem was that the stock was not assigned to website.

STORES > STOCKS > (Assing stock to website/sales channel)