If you're seeing the 'Video Under Review and Can't be Shared' message on TikTok, it means that your video is being reviewed. This can be for a few reasons, but the main reason is that your video is showing content that may not be appropriate for a digital platform like TikTok. This includes videos that show excessive nudity, violence, and other things that are against the community guidelines. It's a little frustrating when you're an influencer and you upload a video, only to have it put under review afterward, but it's a necessary precaution that TikTok takes to ensure their users' safety.
Often, when a video is under review it means that one or more of your previous videos have been reported for being harmful to the young users who use TikTok. The platform is very proactive in ensuring that their users are safe, so it's not uncommon for popular creators to have their videos under review more often than others.
Another reason why your tiktok video could be under review is that it's violating copyright laws or displaying content that doesn't belong to you. This can happen if you're using music from another creator or if you're copying and pasting from other articles online. This is not something that should be done, so make sure you read up on the community guidelines and always respect other people's intellectual property rights when making your own content for TikTok. This will keep you out of trouble and help your account stay healthy.