Just for informartion to this topic, i had the same problem 3 weeks ago.
We fount that problem was with application eID, which our government use for signing of documents with ID card. After uninstaling immediatelly helps.
Yesterday was isued new patch of this application and problen didnt apear so they fix it. Mabe it is something simmilar to your problem, this applicartion protect screen sharing because of security , and change some DLL in windows i think so.
I have the same problem, i use ZOOM more then 3 years , and sudenly i received this error, i tried to reinstall on older version, but dint help me, still the same. i tried to use other account, no change, it is problem with incompatibility on my SW enwironment. I instaled Slack, telegram and Signal application last weeks, i dont know after which instalation start be this probblem, but maybe it is helpfull for you
Just for informartion to this topic, i had the same problem 3 weeks ago.
We fount that problem was with application eID, which our government use for signing of documents with ID card. After uninstaling immediatelly helps.
Yesterday was isued new patch of this application and problen didnt apear so they fix it. Mabe it is something simmilar to your problem, this applicartion protect screen sharing because of security , and change some DLL in windows i think so.
Comment: Zoom and eID are using some same surce/driver/dll/... because during the update eID app was paused - shown window with 2 applications which are recommended to stop before the update - both were Zoom processes. I stopped Zoom totally and let continue the update. After finish I closed eID and started Zoom. Finally there is no problem with sharing!!! Unbelievable, but YES! It helped!!!