The ability to connect a second display to the Thunderbolt 3 docking station's second (also known as 'downstream') Thunderbolt 3 port is ultimately determined by the design internal decisions made by the host system's manufacturer. 

To expand further, system manufacturers have discretion when designing their Thunderbolt 3 systems in regard to how may displays are supported via a single Thunderbolt 3 connection to the host.   Some manufacturer's support two displays via a single Thunderbolt 3 connection, while others may only support one display via a single Thunderbolt 3 connection.  We have produced a video that provides for more information on this topic for those who are curious here --> Link

Unfortunately, system manufacturer's specifications often do not include this level of detail. The best practice is to check directly with your system manufacturer to determine the host system's capabilities.  

Applicable To:

TBT3-UDV