How to use GP Relayer with Logic

The solution on the page you referenced works just fine. Logic was the first DAW we used for testing. There’s even a template Logic file.

You don’t mention what version of macOS you’re using or whether you’re using Intel or Apple Silicon - or what version of Logic you’re using, etc.

Makes it rather difficult to start diagnosing the issue.

Did you actually press the Record button or is the DAW stopped?