Can I be ordered to install Zoom on my computer/phone?

So, since the DoD has stated Zoom is a security issue and no longer use it; my unit still is. They want me to install Zoom on my personal devices (it's still a security threat) to attend a meeting. Can they force me to install it?

UPDATE: Just dialed in using the phone number provided (did not install anything). The briefer sent the slides out afterwards to everyone's .Mil emails. Thanks for all the help and guidance.