android, add receiver block to the manifest, seems to be the last piece of the puzzle for getting a notification to go off, but was not a true alarm.

android/app/src/main/AndroidManifest.xml

@@ -37,6 +37,21 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+
+        <receiver
+            android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationReceiver"
+            android:enabled="true" />
+        <receiver
+            android:name="com.dexterous.flutterlocalnotifications.ScheduledNotificationBootReceiver"
+            android:enabled="true"
+            android:exported="false">
+            <intent-filter>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.MY_PACKAGE_REPLACED" />
+                <action android:name="android.intent.action.QUICKBOOT_POWERON" />
+                <action android:name="com.htc.intent.action.QUICKBOOT_POWERON" />
+            </intent-filter>
+        </receiver>
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and