Can you post a screenshot in here with the server config and the in-game config? Also maybe turn on Verbose Logging in LM Studio so that you get more detailed information on what the AI is doing.
To turn on Verbose Logging, you need to open the three dot menu next to the Developer Logs and just toggle it on. Any attempt of a prompt afterwards will be seen there.
If the port is 1234, the URL should look like this:
http://localhost:1234/v1/chat/completions