Using sample app web ,Your connection has timed out and you cannot join the meeting

I was download the sample webSDK from https://github.com/zoom/sample-app-web
and i build the Jwt that supports server-to-server integrationin in App Marketplace also
with API Key and API Secret. but when i replace the API Key & API Secret and try to join meeting it is given me this message error

Error
Your connection has timed out and you cannot join the meeting. Verify your network connectivity and try again.

Screenshots

Hey @it15,

Here are a few things to make sure of when using the Web SDK:

Let me know if that helps!

Thanks,
Tommy