Steps to replicate:

-Nudge on a device running < desired OS version, before installation deadline
-Configured with acceptableScreenSharingUsage set to True
-Share device screen into MS Teams meeting
-run log show --style syslog --predicate 'subsystem == "com.apple.donotdisturb" && eventMessage CONTAINS "isScreenShared"'

Expected behavior: isScreenShared=1 would be seen in the log output, and that a device would not be Nuged to update during a Teams screen share.
Observed behavior: isScreenShared=0 is seen, and Nudges will be presented during a screen sharing session.

For comparison, the same test was done but sharing via Zoom. In that situation, the log output is isScreenShared=1

While the failure to set the isScreenShared value seems to be a Teams shortcoming, this will lead to unexpected results for Nudge installations. Perhaps an alternate way to ask "is Teams sharing the screen?" could be created.