I sat on the Sonos chat line until I was offered a solution to this problem.
Here’s the solution:
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1. Open the Sonos app for iOS or Android. 2. Navigate to Account > Content Services > Connected Services. 3. Select the service you wish to remove (Apple Music) 4. Select Remove Service. 5. Follow the on-screen prompts to remove the service from the Sonos system.
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After that, from the same Account tab select Content Services > Connected Services > Add Content Service > Choose the service to be added, and select Add to Sonos.
This solved the problem for me.