User login from one WordPress site to another – not working

I have just installed the version 1.3.4 of this plugin and I can’t get it to work.

I just tried with only 2 sites so far.. out of 4 that I have.

The secret key as well as the list of domains is the same on both sites.

I have also manually “verified” the test account that i am using on both sites.

Then, I have started a new browser and I have logged in into Site A (le-rime.com)
Then, I have access the site B (coupons.le-rime.com) and I was NOT logged in.

My assumption was that by accessing the site B, I would not have to login again.

Here is the “List of domains 1”
le-rime.com
coupons.le-rime.com

What am I doing wrong ?
How to get this working ?
How to debug this ?
How can you help ? I can provide you with my Test Account via a private chat or email if needed.

Thanks for your assistance.
/Eric