Hiya @b00y0h and sorry to be slow to get back to you! I think that you’re missing the force on the / /sales redirect:
/ /sales 301!
I assume you have a /index.html and we are showing it instead of processing the redirect?
This article has my recommended workflow for your “proxying content between sites” setup: [Support Guide] Can I deploy multiple repositories in a single site? which recommends a different config (proxy from directory X on site A to directory X on site B) which is a bit easier to troubleshoot, in case you’re open to a slightly different layout.