Hi Yannick, First, one important clarification. That exact message from Amazon ("Amazon is not accepting reviews on this product from this account") does not normally appear before you post a review. As far as we have seen to date, it never shows up at that stage. It almost always means the review had actually gone through at first, and then a few days later, when you went back to check, Amazon had stopped accepting it on that product. Can you confirm that is what happened? That detail matters for reading the situation correctly. Now to your questions. On whether to be concerned: in the large majority of these cases, and this is exactly what we explain in the emails we send whenever a review does not stay up, the cause is one of two things. Either the author received more than one review on the same book within too short a window (typically under 36 hours), or you posted more than one review yourself within a 36-hour window. That said, here is the honest read on your specific situation. You post a high number of non-verified reviews, and so far that has not caused you problems, most likely because your account has a strong purchase history behind it. So right now this is not a red flag for you, and a single case like this does not represent a problem for your account. If you notice it happening again within a fairly short time, that is the point where I would move you toward Verified Paid Purchase reviews and dilute the non-verified ones. One isolated case, no. On the swap hypothesis: it is a rare possibility, but not impossible. Our browser extension drastically reduces this risk. The one scenario where it could still happen is if that author has not uploaded any book on BookVillage, not even under the pen name used on the specific book you wanted to review. In our experience, though, this practically never happens. On deleting the assignment: yes, in this case you can simply delete the assignment. If it had been a Verified Paid Purchase assignment, I would have asked you to contact our email support instead, so we could check whether the issue came from the author's side receiving too many reviews in a narrow window, as I mentioned above. For a KU assignment, deleting it is fine.