How to Share laptop screen from tablet second screen feature

Hi - My Galaxy Tab S8 has second screen capability which puts my laptop screen on my tablet (and let's me navigate the laptop from the tablet).  But when I join a meeting from the tablet and share my screen, if I choose the second screen - the other meeting attendees see a black screen (I am able to share the tablet - so screen share is properly turned on).  I want to join the meeting from the tablet, but I need to be able to share content that is only on the laptop (software demos, etc.).