Teams Add-in is missing in Outlook on a terminal server

Regular Contributor

The Outlook Meeting Add-In is enabled, but the button to create a new meeting is missing.

The mailboxes are hosted on-premises and there is an Exchange hybrid. The issue exists since 28.02.2021, after an update of Teams on both terminal servers.
Checked and the calendar function is not available in Teams. It was not available in the past as well.

The issue doesn't exist on Windows 10 computer.
Error message while running Sara tool: "Microsoft Teams is not installed".

But I noticed that the add-in in Outlook refers to / AppData / Local / Microsoft / Teams and not to / AppData / Roaming /.
I also deleted this folder. And then restarted Teams and Outlook. A new Teams folder has been created under Roaming / Microsoft, but the add-in still refers to Local, even if there is no longer a Teams folder there.

Terminal server: Windows Server 2016 Standard
On Prem server: Microsoft Exchange Server 2016 Cumulative

Outlook version on the server: Microsoft Office Professional Plus 2019, 1808 (Build 10371.20060 Click to Run)
Outlook version on a Windows 10 computer: Microsoft Office Standard 2019, 1808 (Build 10371.20060 Click to Run)

Teams version on the server: (64-Bit), Citrix HDX optimized.
Teams version on the Windows 10 computer: (64-Bit)

Re-installed Teams, but it didn't solve the issue.
Created a new Outlook profile, but it didn't solve the issue.

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