Solution
It is possible to have both the HMI and Embedded UI running on the RIO at the same time.
The Embedded UI is part of the Real-Time application, and is run on the cRIO. In contrast, the HMI is run on a computer and it
communicates with the Real-Time application on the cRIO . You would have to create two separate interfaces (Main VI on Host, Real-Time/Embedded VI on cRIO).