Unable to create unique agent routes for multiple brands - please help

We're setting up a multi-brand account for one of our clients and have run into some trouble. We remember that you have quite a few brands, so was hoping you could help :)

  1. We have brand.zendesk.com and have set up brand1.zendesk.com and brand2.zendesk.com
  2. We're trying to create agent routes or logins for brand1.zendesk.com/agent and brand2.zendesk.com/agent, however they always get redirected to brand.zendesk.com/agent
  3. Have you figured a way with multibrands to create separate logins for your separate brands?

Would really appreciate your input on this :)