I have setup the account in the Admin Console and has added myself as Admin and Product Owner for DTM and Adobe Analytics both.
There are 2 problems I am seeing:
1) When I go to the “Activation” link in the context menu at the top right corner and click on “Launch” link on the page (pl. see screenshot below) as suggested in the activation email I received once the request got completed, I just see this popup with no directions what to do next:
It sounds like you may have an issue with your product configuration groups in the Admin Console. They may not be mapped correctly. Here is a similar question where a user just wasn't an Admin. I've copied and pasted the relevant information below:
Have a look at a video and knowledge base article I produced a few weeks ago (linked below). In both of these, I show how to properly set up a permissions group in the Admin Console and map it back to a DTM permission level.
You can check to see if your existing groups are mapped to DTM permissions correctly by launching the admin console --> click on products from the left nav --> click on DTM --> click on one of the "admin" permissions groups --> look for the mapping (shown in red below)