Corrected user/pass key lookup

app.py

@@ -121,5 +121,5 @@ with gr.Blocks() as demo:
             )
 
 if __name__ == '__main__':
-    auth = tuple(os.getenv(f'GRADIO_{x}') for x in ('USER, PASS'))
+    auth = tuple(os.getenv(f'GRADIO_{x}') for x in ('USER', 'PASS'))
     demo.queue().launch(share=True, auth=auth)