How to add FB pixel via GTM?

I am trying to add FB Pixel via Google Tag Manager within my AMP container.

I added the Pixel image URL as custom Image URL in GTM.
https://www.facebook.com/tr?id=1111111&ev=PageView&noscript=1

But when I preview GTM, FB pixel isn’t firing nor does FB Events Manager show any activity.

Can you please guide me on how to add FB pixel correctly via GTM for Web stories?

 

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