Here's how you can add an additional artist to your Spotify for Artists account:
- Log in to your Spotify for Artists portal via web browser
- In the upper right corner, click on the circle icon with your initial
- Select "Teams"
- Click on “Add Team” near the top right of the "Your Teams" page
- Select "Artist Team"
- Follow the instructions and input your artist URI when prompted
You can learn how to find your Artist URI by checking out this article.
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