Modify a Multi-Room Music Speaker Group
If multi-room music doesn't work, try modifying your speaker group.
- Open the Alexa app 
.  - Select Devices 
.  - Under Speaker Groups, select the speaker group you want to edit.
 - Select Edit to edit a speaker group.
 
If you're still having issues, try creating a new group.
 
     Tip: If you're having trouble setting up or modifying a speaker group, make sure that your devices are on the same network and the account.