Laravel Forge | Deploy branch on subdomain

I have my laravel project setup on Laravel Forge. I have a couple branches that I would like to deploy. I have a main branch and a beta branch.

I would like the main branch to go to mydomain.com and the beta branch to go to beta.mydomain.com

The main branch works, but when I try to setup the subdomain it doesn't work. Am I setting up my DNS wrong, or will I need a seperate server for each branch I want to deploy?

my dns settings:

Type = A
Name = beta
Value = 10.10.10.10 (not my real ip)
TTL = 600 seconds

via Chebli Mohamed