Your 500 error indicates a server-side issue. The client code is simply the caller and can't fix a 500 error coming from the server. Make sure the function at https://getstreamtokenv2-nnvm3z4kea-ez.a.run.app/getstreamtokenv2 is working as expected.

Debugging Steps:

1. Check Server Logs: Look at the server-side logs to identify the cause of the 500 error.

2. Local Testing: If possible, test the function locally before deploying.

3. Dependencies: Ensure all dependencies are correctly installed on the server.

4. Request and Response: Ensure that the request and response formats are correct according to your function's expectations.

Here's an example of how you might log errors in your cloud function:

exports.yourFunction = functions.https.onCall((data, context) => {
 try {
 // Your code here
 } catch (error) {
 console.error(error);
 throw new functions.https.HttpsError('internal', 'An internal error occurred');
 }
});

This should give you a clearer picture of what might be going wrong on the server-side.