Bizarre behavior - Pixel missing parameter error in Catalog Manager for DPA ads

[jax0111]

Hello Shopify gurus! I've encountered something super weird. After reaching out to Facebook representative and Shopify support a dozen times, I'm hoping to get some help here...

My Pixel is installed using the Pixel ID under Online Store -> Preferences.

I created a product feed in Google Sheet and provided the URL to a newly created catalog in Catalog Manager.

No errors or warnings whatsoever from the product feed, until I connect my Pixel with the catalog for dynamic ads.As soon as I connect the two, the catalog will give me an error and a list of URLs: 

However, when I open those URLs, my Facebook helper plugin on Chrome gives all green checks for pageview and viewcontent. I see no warning or error from the plugin whatsoever. 

Has anyone experienced similar issues? Please help! I have been banging my head against the wall for a week now.