1. Privacy setting: The privacy option is set for the video number, and the topic tags that are not allowed to be publicly displayed will not be displayed. Make sure that the privacy settings of the video number allow public display of topic tags.
2. Video content problem: The video is illegal or the content does not meet the platform regulations, which leads to the topic tag being hidden or deleted, so as to ensure that the video content meets the platform regulations and there is no violation.