We created a public app to allow users to login the app using JWT. It turned out that the app was promoted to production and now upon an attempt to generate a new sandbox JWT token by the client for the app he gets an error 'Invalid Client ID'. It appears that the reason for the error is that we used the production app client ID (before it was sandbox client ID), but conversely, I see that production and sandbox client IDs are equal. Could you please advise what app client ID should client use to generate sandbox JWT?