This could be caused by user rights and access to the apps.
Please go to: https://connect.bentley.com/?showAdmin=true if this page is blank, then you are not registered on the system correctly and need your site administrator, to review your details. Please see the link below on how to find your administrator
https://communities.bentley.com/communities/other_communities/licensing_cloud_and_web_services/w/wiki/52644/how-do-i-find-my-administrator
If you already have an account, there may be some missing details that are preventing you gaining access to the apps. In particular, a region must be set with your account. Again your administrator can check this, details can be found in the below article
https://communities.bentley.com/communities/other_communities/licensing_cloud_and_web_services/w/wiki/38139/changing-user-s-entitlement-country