I heard this from other YouTubers.
It's due to the "MFK" (made for kids) issue, part of the
U.S. Children's Online Privacy and Protection Act (COPPA)
You MUS go to YouTube (PC version) web page or YouTube Studio mobile app to answer is your uploaded video made for kids or not.
Guess what, so far even YouTube mobile app cannot set it.
This message was edited 2 times. Last update was at Dec 19. 2019 01:41
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PowerDirector 365