session_id() returns blank

Hello, on ci4 and using MAMP free version.

$id = session_id();

echo $id is blank

I tried this on another framework and I see an id.

Is there a setting I need to change?

I am using the default config.

Thanks

Did you start the session?

Did you start the session?

No, I am using a fresh install of ci4.

Where and how do you do this?

Thanks

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Did you start the session?

No, I am using a fresh install of ci4.

Where and how do you do this?

Thanks

I just found it in the BaseController.