In order to avoid subjecting our system to being taken advantage of, we cannot reveal the exact reasons why some reviews don't get published. However, we do contact reviewers if there are any issues with publishing their review, to help them get it published.
Generally, we publish reviews that comply with our Posting Guidelines within 48 hours. In some cases, we may request more information from the reviewers, such as proof of purchase.
We also request that customers confirm their email address. There may be delays involved in publishing their review if they haven't confirmed their email.
If your customer experiences further issues, please get them to send us a message or direct them to our Help Centre for Consumers.