Websock connection to wss://<ngrok domain>:9090/ws failed

im trying to run the demo project zoomapps-advancedsample-react, but the frontend log from the Zoom Apps embedded browser shows some websocket errors.

if I understand correct, the ngrok running on localhost:3000 for the docker backend server only based on the README guideline. But the Zoom App trying to directly connect to the port 9090 which is not open.

can anyone help me with these errors plz?

Have you made any changes to the app? As I understand, the frontend runs on port 9090 but only ngrok needs to be running on port 3000.

If you are just looking to spin up your first Zoom App you may want to take a look at the basic sample that we have: