Hi Dawnie17,
Could you give me more information about this issue?all users cannot share screen in your environment?what errors did you get when sharing screen?
Check Application sharing using different test to isolate issue.
- Is application/desktop sharing affected between internal to internal and external to external?
- Is application / desktop sharing affected between internal to external to internal and external to internal?
1. Make sure application / desktop sharing enabled on Skype for Business / Lync Server.
SfB /Lync Control Panel > Conferencing > Conferencing policy > select Global or create new policy and set enable ‘Enable application and desktop sharing.
2. Make sure you have update your SFB client to the latest version.
3. please check the port 443, 5061 ,50000- 59999 was open on your firewall.
4. If in case you are seeing blank screen after application/desktop sharing then do below:
Start > Run > Regedit > visit below registry path and delete mentioned key.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\
{00000000-0000-0000-0000-000000000000}
Note: You must Backed up your computer registry first and then removed above Key.
Best Regards,
Leon Lu
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