Hi, We can easily fix this issue.Me too also got the same warning email from Google for my website https://sapbrainsonline.com.
Here is the simple procedure to fix this.
I have added id=”pagelink” in all items … replace pagelink with your real url link . See a sample here
<a href="https://sapbrainsonline.com" id="https://sapbrainsonline.com" itemscope itemtype="https://schema.org/WebPage" itemprop="item">
