To add another Artist to your Spotify for Artists account:
1. Log in to your Spotify for Artists portal via web browser
2. In the upper right corner, click on the circle icon with your initial
3. Select "Teams"
4. Click on “Add Team” near the top right of the "Your Teams" page
5. Follow the instructions and input your artist URI when prompted
You can find your Artist URI by checking out this article.
Below are screenshots to help walk you through the process outlined above.
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