Histoical API of myAPI is giving error for invalid symbol

Hi,

Although i m using symbol provided in sample i.e.. NSE:SBIN-EQ .... history api is giving me below error:

{'s': 'error', 'code': -300, 'message': 'Please provide a valid symbol'}

please help with valid symbol format.

Also, what should be the format for fetching data for n number of symbols say 20 ,30 or 50 symbols in one request

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