This is how you do it
Open MyDesk in Outlook, Teams, web or mobile and select Guest Registration.
Select the relevant date and guest from the meeting or enter the guest manually.
Check the name and company, and possibly add lunch if your solution offers it.
Press Update Guest and check the list of invited guests.
Cancel the pre-registration if the visit is cancelled. Automatic pre-registration of external meeting participants depends on your setup.
See screenshots from the original guide (6)
The screenshots are from the previous guide and may show an older user interface.
