Happened to me when I saw a book on the US site, I wasn’t able to see all reviews, but there was a button to sort-of “apply” to get approved for seeing all of them.
It took five days, then I got this email.
Interestingly, they’re not doing this on the European site, you can still see all reviews there.
I posted a review of a rechargeable mountable lamp that didn’t work, wouldn’t charge. Popped it open because it was broke and I walked to figure out why.
Turns out the electronics caught fire and burnt out. The review was never authorized and never showed up in the site.
I hate Amazon so much, I cannot convince my wife to drop it.