Taming Amazon discussion
Amazon policy update
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I tried it with one of my books to make sure it works. I was able to use the KDP dashboard after using Author Central to update my description.
In the past, once you have edited your description from Author Central, you can no longer use the KDP dashboard. Amazon has fixed this bug and you now can go back to using the KDP dashboard and use the heading tags in your description.
Thanks Amazon!
Now, if only they would fix the bug that won't allow you to use heading tags from Author Central.