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.
Thanks for confirming! That’s the box I saw as well, after clicking on it it said I will get an email in five business days - and it really took the whole five days.