How to use the A channel for every second/tick updates

I’m trying to get the data of a stock every second using the A channel. My code is below:

import alpaca_trade_api as tradeapi

base_url = 'https://paper-api.alpaca.markets'
api_key_id = 'your api key id'
api_secret = 'your api secret'

api = tradeapi.REST(
    key_id=api_key_id, 
    secret_key=api_secret,


base_url=base_url,
)

if __name__ == "__main__":
    conn = tradeapi.StreamConn(
          key_id=api_key_id, 
          secret_key=api_secret, 
          base_url=base_url,
    )

    @conn.on(r'A.AAPL)
    async def handle_second_bar(conn, channel, data):
        print("second", data)

    @conn.on(r'AM.AAPL)
    async def on_minute_bars(conn, channel, bars):
        print('bars', bars)

    conn.run(['A.AAPL', "AM.AAPL"])

I get an error saying ERROR:root:error while consuming ws messages: unknown channel A.* (you may need to specify the right data_stream). The AM channel works and I am getting updates every minute but the A channel doesn’t work. This question has been asked ValueError: unknown channel A.TSLA (you may need to specify the right data_stream) but no solution was provided. How can I fix this issue?

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