Use media_player join and unjoin

config/packages/modules/media/plex.yaml

@@ -10,7 +10,7 @@ automation:
           - media_player.plex_lg
         to: "playing"
     action:
-      - service: sonos.unjoin
+      - service: media_player.unjoin
         entity_id: media_player.living_room
       - service: media_player.select_source
         entity_id: media_player.living_room

config/packages/modules/media/sonos.yaml

@@ -1,14 +1,5 @@
 # Depends on Sonos integration (config flow): https://www.home-assistant.io/integrations/sonos
 
-group:
-  all_sonos:
-    name: All Sonos
-    entities:
-      - media_player.master_bedroom
-      - media_player.living_room
-      - media_player.kitchen
-      - media_player.bathroom
-
 binary_sensor:
   - platform: template
     sensors:
@@ -52,18 +43,26 @@ script:
       - condition: state
         entity_id: input_select.bedroom_mode
         state: "day"
-      - service: sonos.join
-        entity_id: group.all_sonos
+      - service: media_player.join
+        entity_id: media_player.master_bedroom
         data:
-          master: media_player.master_bedroom
+          group_members:
+            - media_player.master_bedroom
+            - media_player.living_room
+            - media_player.kitchen
+            - media_player.bathroom
 
   sonos_join_tv:
     alias: Sonos · Join to TV
     sequence:
-      - service: sonos.join
-        entity_id: group.all_sonos
+      - service: media_player.join
+        entity_id: media_player.living_room
         data:
-          master: media_player.living_room
+          group_members:
+            - media_player.master_bedroom
+            - media_player.living_room
+            - media_player.kitchen
+            - media_player.bathroom
       - service: media_player.select_source
         entity_id: media_player.living_room
         data:
@@ -72,7 +71,7 @@ script:
   sonos_kitchen_unjoin:
     alias: Sonos · Kitchen · Unjoin
     sequence:
-      - service: sonos.unjoin
+      - service: media_player.unjoin
         entity_id: media_player.kitchen
 
   sonos_kitchen_join:
@@ -85,7 +84,7 @@ script:
   sonos_bathroom_unjoin:
     alias: Sonos · Bathroom · Unjoin
     sequence:
-      - service: sonos.unjoin
+      - service: media_player.unjoin
         entity_id: media_player.bathroom
 
   sonos_bathroom_join: