This article is also available in:
For Page View, ViewContent, AddtoCart, InitCheckout events, pixel is tracking for all visitors
If the customers do not have information (email, phone...) so pixel cannot send customer information to Facebook, so there is a warning, it is no problem. If the customer logs in, the app still sends all the information to Facebook.
This is normal
Only clients who are tracked by CAPI have this warning, so no problem. All Pixel apps including Shopify are doing the same

Server Sending Invalid Match Key Parameters
Was this article helpful?
Thank you!