Hi Przem,
Did you just create the subscription and then immediately attempt to sign into the Team Site? If so, the site may not be available quite yet; it can sometimes take a few minutes for the site to finish provisioning and deploying.
Did you rename your site from TeamSite to something else? If you renamed TeamSite, this will break your top reference link.
Here are some troubleshooting steps that you can take to help me figure out what is causing this and what direction we need to go in to get this resolved.
Log into your admin portal and move you mouse over the following areas and note the address that appears in the lower left corner of the screen, the Team Site link at the top of the page, Under the Team Site Section (Visit Team Site) and under the Website section the URL of your website.
In addition,you can refer following article to resolve this issue.
http://support.microsoft.com/kb/2547833
Thanks,
Keats Ge