Hi @jitendra1 ,
Happy to help. Is this the process you followed to generate the JWT token? https://marketplace.zoom.us/docs/sdk/native-sdks/auth#jwt
The SDK key and secret can only be used to authenticate your SDK, but in order to make requests to the Zoom API, you have to create a JWT app and use that app key and secret for requests to the desired endpoints such as /users/{userId}/token
Hope that helps 
Gianni