I'm a registered developer, and the error is not repeatable. It will work for one call and then fail again on the exact same call. What's going on?
@jsd Usually you receive the developer inactive error when you've been rate limited or your access token has expired.
Here is some documentation about the developer inactive error: https://developer.beatsmusic.com/docs/read/faq/Developer_Inactive
Also, if you have been rate limited you can send an email to beatsplatform@beatsmusic.com and they will raise your limit pretty quickly.