Learn Editor: Update Set-Mailbox.md

Author: kundan-bharti

exchange/exchange-ps/exchange/Set-Mailbox.md

@@ -5492,6 +5492,8 @@ The Type parameter specifies the mailbox type for the mailbox. Valid values are:
 - Room
 - Shared
 - Workspace (cloud-only)
+- Desk (cloud-only)
+Setting a mailbox of this type is not sufficient to create a desk and make it available for booking. A desk should be created in the Places directory using [New-Place ](/microsoft-365/places/powershell/new-place)and then linked to this mailbox using [Set-PlaceV3](/microsoft-365/places/powershell/set-placev3).
 
 ```yaml
 Type: ConvertibleMailboxSubType