I found that I did not grant access to BAM Portal. For this purpose I have to use BM.exe utility. This tool is used for administer all things related to BAM, including deployment, permissions and alters.
The command line tool is located at the following location:
[BizTalk installation folder]Trackingbm.exe
bm.exe add-account -AccountName:[DomainGroupName] -View:[BAM View]
bm.exe add-account -AccountName:[DomainSamAccountName] -View:[BAM View]