On Vercel whenever we deploy from a branch usually two preview deployment URLs are generated.
Automatic unique URL site-xadvghg2z-companyname.vercel.app
Automatic Branch URL site-git-hello-world-companyname.vercel.app
This is composed of the following pieces [project-name]-git-[branch-name]-[scope-slug].vercel.app
For all our projects on Vercel, this is how it has been working so far. However, we have one project where only the Automatic unique URL is deployed. The branch url is not deployed. Settings are similar for all projects, and they are all connected through Git Repository in Vercel.
Example
Here fix-branch-name is the name of the branch. However, there is only a single domain deployed.
Next is a working example how we would expect it to behave.
Two domains are automatically deployed, the unique url and branch url.
Any idea what could be wrong ?