Can’t answer inbound call while in zoom meeting

We have a Zoom meeting going all day with all staff members that helps us with training. Most of our staff is able to answer calls and STAY on the zoom meeting. This is for training purposes so mgt can help assist. However several staff, anytime they try to answer the phone using Jabra Bluetooth headset, it will leave the zoom meeting. But it’s working fine for everyone else.  anyone have any ideas what we can look at to figure out what’s causing this?   Thanks!