Cross subdomain Administrator login with login

Question

I have sites with two subdomains

• www.example.com
• test.example.com

Both speak with the same DB. However, both are separate code bases.

I want the admin login to be saved between the two sites. (If you register on www, you automatically register for testing and vice versa)

I have these settings in settings.py

CSRF_COOKIE_DOMAIN = SESSION_COOKIE_DOMAIN = ".example.com"
SECRET_KEY ="theeisnospoonblahblah"

Admins seem to be talking, but weird.

If I go to www.example.com and log in to the Administrator, if I go to test.example.com, instead of logging in to test.example.com admin,

I automatically exit www.example.com.

I miss the settings in settings.py