You can temporary workaround this issue using direct request to https://domain:8443 from your web browser then accepting self-signed certificates.
Here domain.com is domain name of your wcs server.
If you have any troubles with initial certificates import, please send SSH access and certificates files to support@flashphoner.com
We will import certificates.
As you can see your Let's Encrypt SSL certificate has been expired https://app.qwyet.com:8888
That's why your streaming app does not work.
Please fix SSL issue and try again.
You can fix SSL issue importing a new valid SSL certificate.