Copyright issues
The video you shot and uploaded may be because some pictures or fonts in the video involve some trademarks or celebrities' names, so the video is restricted by the background of Tik Tok and others cannot watch it. For example, if you record an exclusive TV series on another platform, it will be removed from the shelf and moved into a private video due to copyright issues.
Violation problem
It may be that there are some illegal contents and words such as violence, pornography and vulgarity in the video content you uploaded, which leads to your video being detected by the background of Tik Tok and then being harmonious. For example, if you post a video of yourself driving a racing car, it is likely to be blocked because of speeding, racing and other reasons, resulting in the video being seen only by yourself.