Fix Utilities.host/Utilities.platform

src/helpers/utilities.ts

@@ -45,7 +45,11 @@ function getHostInfo(): {
   // when queried from within an add-in.
   // If the platform already exposes that info, then just return it
   // (but only after massaging it to fit the return types expected by this function)
-  const context: IContext = ((window as any).Office && (window as any).Office.context) || useHostInfoFallbackLogic();
+  const Office = (window as any).Office as { context: IContext };
+  const isHostExposedNatively = Office && Office.context && Office.context.host;
+  const context: IContext = isHostExposedNatively
+    ? Office.context
+    : useHostInfoFallbackLogic();
   return {
     host: convertHostValue(context.host),
     platform: convertPlatformValue(context.platform)