To use Presentify with any video conference apps, like Zoom, Teams, etc. you have to select the entire screen while sharing instead of a single app (or window) as shown below:
Reliance Jio has done a commendable job releasing a video conferencing app in a short time frame, however, it received criticisms that it copied pixel by pixel from Zoom. I actually agree with some of the criticisms but that’s for another blog post.