What's the issue?

• Adsense auto-ads stop delivering on my website on mobile since Feb 11.
• error message on console (toggle device to any mobile device) said:
  [amp-auto-ads] No anchor element found or unable to fulfill ad strategy
• works normally on the desktop browser

How do we reproduce the issue?

1. open Chrome dev tool
2. toggle "device" (RWD) to any mobile device (eg., iPhone X)
3. switch to Console page
4. open the following page (or any page range from 10000 to 23260)
   https://womany.net/articles/23268/amp
   https://womany.net/articles/23267/amp
   https://womany.net/articles/11060/amp
   https://womany.net/articles/10000/amp
5. see error [amp-auto-ads] No anchor element found appear in the console. No auto-ads shows up. (besides the three DFP fixed banners that we add in the meantime)

What browsers are affected?

• Any mobile device.
• Work on the desktop.

Which AMP version is affected?