Thanks for using Zoom SDK. The user ID would be your email address or the ID retrieve from Zoom API. Based on the error message shown in the screenshot, the user ID is not the root cause. Are you trying to generate JWT token for SDK authentication? You may follow the instruction here: https://marketplace.zoom.us/docs/sdk/native-sdks/android/mastering-zoom-sdk/sdk-initialization. And don’t forget the tokenExp will be a timestamp rather than a time.