When PLAXIS 2D or PLAXIS 3D is run for the first time, the license server will inform you if you have been provided the entitlement to use PLAXIS and any other license you have chosen.
It is possible to check that you have suitable entitlements before attempting to run PLAXIS by clicking on the Activation Wizard from the License Configuration dialog. Enter the details of the products/licenses required but that are not currently shown. If these products are included in your entitlement, then they will be displayed with the provided entitlement details.
The Activation Wizard displays the entitlement status of all products that you have run on the local machine.
For more information on activation see here How to activate products under Subscription Entitlement Service.