4. (Due to UAC issues) From another computer navigate to the c$ administrative share of your Server 2019 session host and locate the "c:\program files\windowsapps\MSTeams_#####.###.####.####_x64__iwekyb3d8bbwe\" folder (Example: \\rdsh01\c$\program files\windowsapps\MSTeams_#####.###.####.####_x64__iwekyb3d8bbwe\)
5. copy the "MicrosoftTeamsMeetingAddinInstaller.msi" file to the c:\ drive somewhere on the RDSH server
6. Run the msi file acquired in step 5 on the RDSH server and install for everyone (administrative command prompt and in install mode). Also install path should be to C:\program files (x86)\Microsoft\TeamsMeetingAdd-inn\#.##.#####\ (with # symbols being version number)
7. Find section titled “Outlook presence integration with New Teams in Windows Server 2019” from the article https://learn.microsoft.com/en-us/microsoftteams/new-teams-vdi-requirements-deploy?fbclid=IwAR3hGgEa-B4U_o7uveN1ZL9BV-NkR6vZqh5j-tGm9d4Wg0YA17eVJaBalm8
8. Click on the link in step 4 of this section to download the presence integration installer
9. If the server is up to date on all cumulative updates you should only need to open the local group policy on the machine by opening gpedit.msc from a run dialog box and enabling the policy at the following location "Computer Configuration\Administrative Templates\KB5035849 240209_02051 Feature Preview\Windows 10, version 1809 and Windows Server 2019\"
10. Don't worry about the ALLUSERS switch and running from a command line. Run from GUI after putting server into install mode. Run the installer acquired in step 8 and choose to install for "Everyone" or "all users" in the dialog screen when installing.
