Have you set up Ezoic placeholders on your AMP pages? You'd need to do a separate Ezoic placeholder setup for AMP as we can't transfer Ezoic placeholders across from normal pages.
To check on this, please navigate to Big Data Analytics > Technology > Framework and take a look at the report.
This report allows you to see revenue and EPMV by device. Historically, mobile EPMV will be lower compared to desktop, and this report will show the difference.
You can also use this report to see if AMP pages are correctly set up. It’s a red flag if you see $0 or near $0 EPMV for the AMP framework. If this is the case, you will need to check the placeholders as soon as possible on the AMP pages.
Go to the site on an AMP URL, then in the mobile version, turn on the Chrome Extension and see where the placeholders are. If you see no placeholders, that means no ads will show.
If there are no placeholders, here's how to add these to a top AMP landing page super quickly:
Using the Ezoic Chrome Extension.
I would also recommend taking a look through the following Support article to ensure your setup is optimized:
Is my Ezoic setup optimized?