Cannot access historical data with api

i am able to authenticate with api and read my personal details and orders. But when i try to fetch historical data, i get permission error.

Eg-python

data = {"symbol":"NSE:SBIN-EQ","ohlcv_flag":"1"}

fyers.depth(data)

{'s': 'error', 'code': -438, 'message': 'your app does not have the permission'}