Hi @golden1 ,
You can try out the following solutions:
1. Go to Your Business Manager -> Brand Safety -> Domains, see if your domain is verified yet, if not, proceed to verify your domain.
2. Use Event Set Up Tool to send events to your FB pixel. Basically, prior to running Facebook Ads, your FB pixel should record events fired on your website first -> then you verify your domain -> then you run your FB ads. So if you don't see any event yet, you should go to Event Manage -> Test Events -> Event Set Up Tool then proceed to add Events to your Online Store and see if they can fire correctly.
Let me know if my answer is of any help or not with a thumb up or like
What is your pixel ID and your store?
Seeing these, we can tell if it's been added to your store.
Furthermore, testing using Richard's method can help diagnose event issues if the chrome extension does not work for you(which I haven't had happen before).