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Hello prefect team. We are in the middle of upgrading from prefect 2 to 3.

I'm having trouble getting the basic usage of a local prefect server working.
I start it with: `prefect server start --port 4201` as I have before, but I get this message in the bottom right of the browser:
```Can't connect to Server API at <http://localhost:4200/api>. Check that it's accessible from your machine.```
and nothing shows up in the UI when I run flows. Can anyone help me figure out what is wrong?

I have tried on each of 3.4.4, 3.4.5, 3.4.6, and 3.4.7. I can't get this working on any of them

It seems like there is a clearly a problem that the browser is complaining about accessing port 4200, when I am running this on 4201, but I'm not sure how to correctly configure it

Hey the UI (which can be run separately) has a dedicated setting for connecting to the api.

If you run `prefect config set PREFECT_UI_API_URL="<http://127.0.0.1:4201/api>"`

first, then the UI knows where to reach the server.