Welcome to Spotify Community and thanks for reaching out here!
First of all, I'd like to suggest that you double-check if all the Echo devices are linked with the same Amazon account and if they all are linked to your Spotify account.
Considering everything is correct on your side, but the issue persists, I recommend that you unlink your Alexa account to Spotify and then link them both again. To unlink them, follow these steps:
- Go to your Spotify account page;
- Then, go to Apps;
- When finding Alexa, tap Remove Access
After removing the access, you need to link the services again, as I mentioned before. To do this, you can follow these steps. And don't forget to set Spotify as the default music service.
After doing this, let me know how it goes.
If you have further questions or if you need anything else, let me know! I'd love to help!
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Note: I'm not a Spotify employee.