To check which articles had pageviews in an AMP format, check Search engines box in your Source groups in Home report:
AMP filter will appear below:
If this line did not appear, this means your AMP pages are not added to the dashboard. To do this you should ask your IT team to help.
To set a task for them go to Documentation:
and choose a Google AMP tab:
Don't worry, this integration will take them a few minutes :)
After they add a code AMP traffic will appear in your dashboard automatically.