Degraded Performance: Visitors Add-in (Delegate Senarios)

After monitoring the implemented solution, the issue related to the degraded performance has been resolved.

We have implemented a solution and are currently monitoring the performance.
In delegate senarios (adding a guest on behalf of someone else), users should now be able select themselves to be notified, when using the Visitors Add-in, in the Windows Outlook Client.

Our Development Team has identified the cause of the issue and are actively working on a solution.

In delegate senarios (adding a guest on behalf of someone else), users cannot select themselves to be notified, in the Visitors Add-in, in the Windows Outlook Client.
We are currently investigating the issue.

As a temporary workaround, Outlook on the Web can be used. Mac users are not affected.