Moving domain from one project to another

I have 2 projects. One is live and published on our domain.

We want to switch our domain to the other project. We are not using “home” project configuration.

This help page:

https://help.readymag.com/hc/en-us/articles/9890974273307-Transferring-connected-domains

says that we should see a button to “switch our domain to current project” after we enter our domain name on the new project. But we don’t. It treats it like is has never seen the domain before, and provides DNS instructions. I’ve tried with both the www. version and the pure domain version.

Is there a way to move a domain that is up and functioning on one of our projects, to our other project?

Has anyone run into this issue before?

The instructions don’t seem to be up to date or something?

Many thanks for anyone’s help!
-Brendan