Your Trellix licensed products must first be checked in to the ePO - On-prem server before they can be installed on managed systems.
If you have selected the Enable Automatic Product Installation, the products are installed along with the ePO installation.
If you didn't select the Enable Automatic Product Installation option during the ePO - On-prem installation, you can manually check in products on the ePO - On-prem server.
On your ePO - On-prem server desktop, click the Launch ePolicy Orchestrator icon.
When the Log On screen opens, type your credentials and select a default language for the console.
The default dashboard appears the first time you log on to ePO.
Select Menu → Software → Software Catalog.
In the Software Catalog page Category list, filter by product categories, or use the search box to find your software.
When you have located the correct software, select Check In All.
Under Check In, review and accept the product details and End User License Agreement (EULA), select the Client Package Branch, then click Check In to complete the operation.