Using Postman, getting validation error for live trading but not paper

Environment

Language
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Python 3.8 but testing with Postman first

Alpaca SDK Version
If you’re using an SDK library to interface with the Alpaca API, please include the version number you have installed in your environment.
Latest

Other Environment Details
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Problem

Summary
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Paper or Live Tradng?
Let us know if you’re using the paper trading simulator or the live trading API.
Paper trading is working, live trading is not in Postman and Python SDK

Example Code
If you have code that reproduces the problem or will make your issue more clear, please include it here

print(account)
positions = api.list_positions()
print(positions)

order = api.submit_order(
    symbol='SPY',
    side='buy',
    type='limit',
    qty='10000000000',
    time_in_force='day',
    order_class='bracket',
    limit_price='300',
    take_profit=dict(
        limit_price='305.0',
    ),
    stop_loss=dict(
        stop_price='295.5',
        limit_price='295.5',
    )
)
print(order)
api.cancel_all_orders()```