diff --git a/homeassistant/components/plex/__init__.py b/homeassistant/components/plex/__init__.py
index 01f80ed0d2b..4556422dd00 100644
--- a/homeassistant/components/plex/__init__.py
+++ b/homeassistant/components/plex/__init__.py
@@ -215,7 +215,7 @@ def play_on_sonos(hass, service_call):
 
     sonos = hass.components.sonos
     try:
-        sonos_id = sonos.get_coordinator_id(entity_id)
+        sonos_name = sonos.get_coordinator_name(entity_id)
     except HomeAssistantError as err:
         _LOGGER.error("Cannot get Sonos device: %s", err)
         return
@@ -239,10 +239,10 @@ def play_on_sonos(hass, service_call):
     else:
         plex_server = next(iter(plex_servers))
 
-    sonos_speaker = plex_server.account.sonos_speaker_by_id(sonos_id)
+    sonos_speaker = plex_server.account.sonos_speaker(sonos_name)
     if sonos_speaker is None:
         _LOGGER.error(
-            "Sonos speaker '%s' could not be found on this Plex account", sonos_id
+            "Sonos speaker '%s' could not be found on this Plex account", sonos_name
         )
         return
 
diff --git a/homeassistant/components/sonos/__init__.py b/homeassistant/components/sonos/__init__.py
index f19816e865d..cc33134c810 100644
--- a/homeassistant/components/sonos/__init__.py
+++ b/homeassistant/components/sonos/__init__.py
@@ -58,8 +58,10 @@ async def async_setup_entry(hass, entry):
 
 
 @bind_hass
-def get_coordinator_id(hass, entity_id):
-    """Obtain the unique_id of a device's coordinator.
+def get_coordinator_name(hass, entity_id):
+    """Obtain the room/name of a device's coordinator.
+
+    Used by the Plex integration.
 
     This function is safe to run inside the event loop.
     """
@@ -71,5 +73,5 @@ def get_coordinator_id(hass, entity_id):
     )
 
     if device.is_coordinator:
-        return device.unique_id
-    return device.coordinator.unique_id
+        return device.name
+    return device.coordinator.name
diff --git a/tests/components/plex/mock_classes.py b/tests/components/plex/mock_classes.py
index 3812e9c87b9..eacee6d9f98 100644
--- a/tests/components/plex/mock_classes.py
+++ b/tests/components/plex/mock_classes.py
@@ -78,9 +78,9 @@ class MockPlexAccount:
         """Mock the PlexAccount resources listing method."""
         return self._resources
 
-    def sonos_speaker_by_id(self, machine_identifier):
+    def sonos_speaker(self, speaker_name):
         """Mock the PlexAccount Sonos lookup method."""
-        return MockPlexSonosClient(machine_identifier)
+        return MockPlexSonosClient(speaker_name)
 
 
 class MockPlexSystemAccount:
@@ -378,9 +378,9 @@ class MockPlexMediaTrack(MockPlexMediaItem):
 class MockPlexSonosClient:
     """Mock a PlexSonosClient instance."""
 
-    def __init__(self, machine_identifier):
+    def __init__(self, name):
         """Initialize the object."""
-        self.machineIdentifier = machine_identifier
+        self.name = name
 
     def playMedia(self, item):
         """Mock the playMedia method."""
diff --git a/tests/components/plex/test_playback.py b/tests/components/plex/test_playback.py
index dafc8720ab1..82682ea0ac2 100644
--- a/tests/components/plex/test_playback.py
+++ b/tests/components/plex/test_playback.py
@@ -39,7 +39,7 @@ async def test_sonos_playback(hass):
 
     # Test Sonos integration lookup failure
     with patch.object(
-        hass.components.sonos, "get_coordinator_id", side_effect=HomeAssistantError
+        hass.components.sonos, "get_coordinator_name", side_effect=HomeAssistantError
     ):
         assert await hass.services.async_call(
             DOMAIN,
@@ -55,7 +55,7 @@ async def test_sonos_playback(hass):
     # Test success with dict
     with patch.object(
         hass.components.sonos,
-        "get_coordinator_id",
+        "get_coordinator_name",
         return_value="media_player.sonos_kitchen",
     ), patch("plexapi.playqueue.PlayQueue.create"):
         assert await hass.services.async_call(
@@ -72,7 +72,7 @@ async def test_sonos_playback(hass):
     # Test success with plex_key
     with patch.object(
         hass.components.sonos,
-        "get_coordinator_id",
+        "get_coordinator_name",
         return_value="media_player.sonos_kitchen",
     ), patch("plexapi.playqueue.PlayQueue.create"):
         assert await hass.services.async_call(
@@ -89,7 +89,7 @@ async def test_sonos_playback(hass):
     # Test invalid Plex server requested
     with patch.object(
         hass.components.sonos,
-        "get_coordinator_id",
+        "get_coordinator_name",
         return_value="media_player.sonos_kitchen",
     ):
         assert await hass.services.async_call(
@@ -105,10 +105,10 @@ async def test_sonos_playback(hass):
 
     # Test no speakers available
     with patch.object(
-        loaded_server.account, "sonos_speaker_by_id", return_value=None
+        loaded_server.account, "sonos_speaker", return_value=None
     ), patch.object(
         hass.components.sonos,
-        "get_coordinator_id",
+        "get_coordinator_name",
         return_value="media_player.sonos_kitchen",
     ):
         assert await hass.services.async_call(