Problems with reviews in Magento 2.4 can be related to several aspects. Amasty specialists recommend checking the caching and indexing settings. Sometimes the problem is that review updates are not displayed due to the old cache, so it is worth clearing the cache and rebuilding the indexes. For notifications, it is important to make sure that the email settings for reviews are activated in the Stores > Configuration > Customer > Reviews section. You should also check the Magento logs for errors related to sending notifications. For the correct operation of the system, it is worth using extensions like which provide reliability and additional features.