It appears that an ISIN change has occurred for all the mentioned instruments. Please use the correct instrument keys as below:
- NUVAMA →
NSE_EQ|INE531F01023 - CAMS →
NSE_EQ|INE596I01020 - CHOLAFIN →
NSE_EQ|INE121A01024
Note: Instrument JSON files are refreshed daily as per the documentation: Instruments | Upstox Developer API
Please ensure you refresh the files on your end as well.
Thanks!