Annotate keyboard not working inside shared screen

Hi Everyone,

I've used Zoom to teach for 3 years and depend on the "annotate" function.  Today, the keyboard would not work inside a shared screen.  My own keyboard was not the problem.  I could use the keyboard with annotate if I shared the whiteboard.  When I shared a screen, and wanted to "markup" the share, the keyboard was ineffective.  Any ideas?  I'd like to use this feature in my class tomorrow.  Thanks very much!