Where is the Zoom custom URL hidden in macOS?

[rand-3]

We recently cancelled our Zoom service, but still have Zoom meetings with other companies. When we cancelled our Zoom service my macOS Zoom app stopped working. I found the Command-Option-Shift-D feature for network diagnostics, and when I run those I see several errors about DNS lookups that are still trying to use our custom URL.

I've searched and searched on my Mac, and I've un-installed and re-installed Zoom several times all without success, every time I install the Zoom app it tries to use our custom URL.  I've even downloaded a new Zoom installer on my personal laptop and installed Zoom there and everything works great; I then copied that installer to my work laptop and used it to install Zoom and it still tries to use our old, and not working custom URL.

Does anybody know where Zoom hides that custom URL on Macs? So I can go delete that file and get the Zoom app working again?

Thanks all!