Action Menu Items - MacOS

I’m trying to create a custom protocol on MacOS for Action Menu Items but I don’t have any good result. I’m currently on Monterey and I’m following exactly this procedure:

As soon as I try the Action Menu Item, it goes to “414 Request-URI Too Large”. And If I’m using Light Payload, when I’m trying my Action Menu Item again it simply jumps to my SG Home page screen…

I also followed this video from 2017 (at 20min): Developer Training - Shotgun: Creating, Testing, and Debugging Action Menu Items - YouTube
And I have the same result above…

Am I missing something?

Any news from anyone trying to setup custom protocol on MacOS?
Support team? >.<