Troubleshooting : Multi mode does not work
If Multi Mode on your Speaker does not work - there are several troubleshooting options you can attempt:
Multi Mode is not activated on the Speaker.
Push the SINGLE/MULTI MODE button on all speakers to be included in the Multi Mode group.
The Speaker who originally started streaming audio in the group (server) has dropped out of the group.
Start playing music again on the server Speaker or configure the group in the Marshall Multi Room App.