YouTube Topic Channels are autogenerated by the platform whenever an artist releases music on YouTube.
If you've already released music to YouTube and want to set up an Official Artist Channel, you'll need to provide your Topic Channel ID.
How to find your YouTube Topic Channel ID
Your Topic Channel ID can be found at the end of your YouTube topic channel URL.
It consists of a string of letters, numbers, and special characters after /channel/ - as shown below.
You can submit your Topic Channel ID to claim your Official Artist channel here.