diff --git a/Marlin/src/MarlinCore.cpp b/Marlin/src/MarlinCore.cpp
index 3aa430db20..2a168373d8 100644
--- a/Marlin/src/MarlinCore.cpp
+++ b/Marlin/src/MarlinCore.cpp
@@ -282,7 +282,7 @@ Marlin marlin;
 
 // Marlin static data
 #if ENABLED(CONFIGURABLE_MACHINE_NAME)
-  MString<64> Marlin::machine_name;
+  TString Marlin::machine_name;
 #endif
 
 // Global state of the firmware
diff --git a/Marlin/src/MarlinCore.h b/Marlin/src/MarlinCore.h
index 35482983ec..4d0414dee0 100644
--- a/Marlin/src/MarlinCore.h
+++ b/Marlin/src/MarlinCore.h
@@ -48,7 +48,7 @@ void safe_delay(millis_t ms);
 class Marlin {
 public:
   #if ENABLED(CONFIGURABLE_MACHINE_NAME)
-    static MString<64> machine_name;
+    static TString machine_name;
   #endif
 
   static MarlinState state;
diff --git a/Marlin/src/gcode/config/M550.cpp b/Marlin/src/gcode/config/M550.cpp
index ed7dc49159..7adeb1378f 100644
--- a/Marlin/src/gcode/config/M550.cpp
+++ b/Marlin/src/gcode/config/M550.cpp
@@ -28,31 +28,27 @@
 #include "../../lcd/marlinui.h"
 
 /**
- * M550: Set machine name
+ * M550: Set or Report Machine Name
  *
- * Parameters:
- *  P "<name>" Set the name using the 'P' parameter (RepRapFirmware)
- *  "<name>" Set the name using the "string" parameter
+ *   <name> - Set the name using the "string" parameter
+ *
+ * With GCODE_QUOTED_STRINGS:
+ *   "<name>" - Set the name using the "string" parameter in quotes
+ *              NOTE: Works with or without quotes
+ *
+ * Without parameters, this reports the current machine name
  */
 void GcodeSuite::M550() {
-  bool did_set = true;
-
-  if (parser.seenval('P'))
-    marlin.machine_name = parser.value_string();
-  else if (TERN(GCODE_QUOTED_STRINGS, false, parser.seen('P')))
-    marlin.machine_name = parser.string_arg[0] == 'P' ? &parser.string_arg[1] : parser.string_arg;
-  else if (parser.has_string())
-    marlin.machine_name = parser.string_arg;
-  else
-    did_set = false;
-
-  if (did_set) {
-    marlin.machine_name.trim();
-    ui.reset_status(false);
-  }
-  else
+  if (parser.has_string()) {
+      marlin.machine_name = parser.string_arg;
+      marlin.machine_name.trim();
+    }
+  else {
     SERIAL_ECHOLNPGM("RepRap name: ", &marlin.machine_name);
+    return;
+  }
 
+  ui.reset_status(false);
 }
 
 #endif // CONFIGURABLE_MACHINE_NAME
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 6be3b167db..8ba0cdeb84 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -4556,10 +4556,6 @@ static_assert(WITHIN(MULTISTEPPING_LIMIT, 1, 128) && IS_POWER_OF_2(MULTISTEPPING
   #error "Only enable ULTIPANEL_FEEDMULTIPLY or ULTIPANEL_FLOWPERCENT, but not both."
 #endif
 
-#if ENABLED(CONFIGURABLE_MACHINE_NAME) && DISABLED(GCODE_QUOTED_STRINGS)
-  #error "CONFIGURABLE_MACHINE_NAME requires GCODE_QUOTED_STRINGS."
-#endif
-
 /**
  * Shared Microstepping Pins Sanity Check
  */
diff --git a/Marlin/src/lcd/marlinui.cpp b/Marlin/src/lcd/marlinui.cpp
index f475b52efc..47f5991cef 100644
--- a/Marlin/src/lcd/marlinui.cpp
+++ b/Marlin/src/lcd/marlinui.cpp
@@ -1618,7 +1618,6 @@ uint8_t expand_u8str_P(char * const outstr, PGM_P const ptpl, const int8_t ind,
         msg = GET_TEXT_F(WELCOME_MSG);
       #endif
     }
-
     else if (ENABLED(STATUS_DO_CLEAR_EMPTY))
       msg = F("");
     else
diff --git a/Marlin/src/module/settings.cpp b/Marlin/src/module/settings.cpp
index 261f1aa937..94b7b6f504 100644
--- a/Marlin/src/module/settings.cpp
+++ b/Marlin/src/module/settings.cpp
@@ -588,7 +588,7 @@ typedef struct SettingsDataStruct {
   // CONFIGURABLE_MACHINE_NAME
   //
   #if ENABLED(CONFIGURABLE_MACHINE_NAME)
-    MString<64> machine_name;                            // M550 P
+    TString machine_name;                                // M550
   #endif
 
   //