{'error': 'invalid_grant', 'error_description': "Please check the 'sub' claim. The 'sub' specified is " 'invalid.'}

Hello, 

do you mind sending me the enterprise id for your Box instance and client id of the application? 

Thanks, 

Alex, Box Developer Advocate

Hi 395005653353

My enterprise id is zero and cliend id of the application is "57iihmgthujsqpav8gafrg66dvulw655"

Thanks

Ah - I see. You will need to have a paid enterprise plan in order to use a JWT application. They have to be approved in your instances admin console - and you will only gain access to that after having a paid enterprise level account. You can also use a sandbox in created from a paid enterprise plan.