I have been trying to connect my already existing pixel to my Shopify store using the Facebook sales channel app. But when I connect my FB profile and the relevant Business manager, I can't see my pixel in the list of available pixels. Even though that pixel is a very old pixel and is already connected to the business manager and I have all the access.
I really want to use the same pixel as it has all of the data collected by spending thousands of dollars.
Can somebody let me know what is the solution for this?