Adsense ad code appeared so many times on sites I don't own

I have observed a new noticed on the dashboard of my google adsense account in which adsense claims In the past 7 days, your ad code has appeared a significant number of times on sites you don't own. To avoid lost revenue, make sure to add these sites to your verified sites list in Site Management

in the section of MY SITES --> manage site: there is only one (1) approved site (my website) and the other one that uses my ad code is not verified and of course i will not verify it.

My questions are:
-Is this may cause me an adsense account closer?
-How to report such activity to google adsense ?

Please answer my questions and provide me a guide on how to avoid such activity.

looking forward to your reply!

To protect your adsense account, add all your domain to adsense's Site management. Adsense will not count revenue from unverified site/site that you don't own.

- It will not harm your account
- no need to report such activity.



https://support.google.com/adsense/answer/65062?hl=en&ref_topic=2781147

Thank you so much for your answer