Problem with TLS on secured websocket to websocket server in AWS instance

I registered a subdomain to an amazon ec2 public DNS(of windows instance), and there is a websocket server to echo any messages.
I faced in some problems with it.

  1. I could get success to get message back with ip address, but couldn’t get success with subdomain, of course without certificates installed.
    ws://xx.xx.xx.xx:xx:myport worked.
    ws:// worked also.
    ws:// didn’t work.

  2. I ran webserver with certificate to access tls applied websites.(especially windows, C#, SuperSocket library) and it is configured with SSL certificate.(from Sectigo).
    But an exception is occured on serverside.
    Here is a screenshot.

Please help me if anyone could face in these kind of problems, or anyone knows why this can be happened.

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