Do redirect rules in pages only work on the apex domain not on CNAME custom domain?

I have setup a custom domain for my clients "docs.clientA.com" which is setup to a cname to my pages project -- this works, but i need a redirect rule so that if the client goes to https://docs.clientA.com it wont show my pages apex domain, i only want it for authenticated nested paths such as /dash /account etc. (This is a whitelabeled saas)

so i set up a redirect rule, but it seems they dont work on custom domains?
Was this page helpful?