ManyCam virtual webcam not detected on M3 mac

I recently upgraded from a 2016 intel based macbook pro, to the new 2023 M3 macbook pro.
Manycam works on my old computer intel mac, but not new M3 macbook pro.
Firefox and Chrome are not detecting the manycam virtual webcam. I am using the latest version of firefox and manycam and followed this doc
https://help.manycam.com/knowledge-base/manycam-virtual-webcam-is-not-detected-in-firefox-for-macos/
But still does not work.

Is there anything else I can try?

I got the same issue, hope someone answer or response how to fix,