Well, really simplifies it‘s another protocol running over AutoVPN. Which VDI solution are you referring to? What does the setup look like?
Simplified further: if you can pin down the protocol and port(s) talked, you can prioritize that kind of traffic. But again: what does your setup look like? There are a lot of factors that need to be taken into account that makes it hard to give definite answers here. Or perhaps I‘m missing some obvious stuff...
What‘s „WVD“ you’re referring to with authentication?