Why is my 𝚌𝚊𝚜𝚑 𝚊𝚙𝚙 saying this 𝚌𝚊𝚜𝚑 out failed?

https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC
https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC

https://support.google.com/youtubekids/thread/347413715?hl=en&sjid=8814749851192091274-NC

Why is my 𝚌𝚊𝚜𝚑 𝚊𝚙𝚙 saying this 𝚌𝚊𝚜𝚑 out failed?