It's a simple fix!
If any Amazon Prime Canada subscriber is experiencing difficulties with Amazon Prime Music Canada, you need to contact Amazon support. Amazon is aware of a problem where Canadian subscribers are erroneously being redirected to Amazon Prime Music U.S.
It's an easy fix but it will take about 24 hours for the correction to migrate across all the Amazon servers.
All you need to do is open a chat session with Amazon support.
Note: This migration will not impact your ability to purchase on Amazon.com.