We all have faced this issue where Dynamics 365 keeps opening the login page in the new tab.

If we check the URL it is basically redirecting to

Below URL à

To disable this behaviour for all the users, disable the learning path.

Set Enable Learning Path as No.

For individual user, select Opt Out of Learning Path from Personal Options.

https://docs.microsoft.com/en-us/previous-versions/dynamicscrm-2016/admins-customizers-dynamics-365/mt826648(v=crm.8)?redirectedfrom=MSDN

For Internet Explorer (without changing above settings)

http://ronaldlemmen.blogspot.com/2017/02/unlimited-redirects-or-popups-to.html

Hope it helps..

Here is the step by step process for adding Dynamics 365 Marketing to your dynamics 365 instance.
You can sign up for, install, and use a trial version of Dynamics 365 Marketing for free. Trials last for 30 days.

Few important points to remember :

• You will receive a trial Dynamics 365 instance together with your Marketing trial. You must run the Marketing trial on a trial instance, and can’t install it on a production instance.
• You can’t convert a trial instance into a production instance.
• You can install, at most, one Dynamics 365 Marketing trial per Microsoft 365 tenant.

1. Go to the admin platform of your tenant:  https://admin.powerplatform.microsoft.com/  
   Expand Admin centers and click on Dynamics 365:
   
2. In Dynamics 365 Admin centre, click on Applications tab  –> Select Dynamics 365 Marketing Application  –> Click on Manage:
   
3. Otherwise access this url directly :  https://port.crm8.dynamics.com/G/Applications 
   [Replace crm8 with appropriate region]. Follow…