No live streaming trades for SPY or BTCUSDT?

I am using the example provided here:
https://github.com/alpacahq/alpaca-trade-api-js/blob/master/examples/websocket_example_datav2.js

And am not receiving any live stream trades for SPY.

I also adjusted the code to use crypto_stream_v2 and onCryptoTrade for the symbol BTCUSDT. It doesn't either produce any trade signals.

I am using feed: 'iex' as well as paper.

What could be wrong?