YouTube API request failed: Invalid Channel
Solution
If you get the messageĀ "YouTube API request failed: Invalid channel", then this means that the channel id you entered is not valid.
You need to use the CHANNEL ID and NOT the USER ID. :-)
WRONG EXAMPLE:
FitnessBlender
WRONG EXAMPLE:
https://www.youtube.com/watch?v=fcN37TxBE_s
CORRECT EXAMPLE:
https://www.youtube.com/channel/UCiP6wD_tYlYLYh3agzbByWQ
CORRECT EXAMPLE:
UCiP6wD_tYlYLYh3agzbByWQ
"FitnessBlender" above is a USER, and they can have MULTIPLE YouTube channels.