Why can't I connect my Facebook pixel to my online store?

[SaulehAsif]

I am trying to connect facebook pixel to my shopify store. I am able to connect business manager and ad account but it does not show my page anywhere. It gives error as 'no pages found'. I have previously connected facebook pixel to shopify stores so I know how to do that. But right now, it does not show pages to connect even though I am admin of business managfer, ad account and page.