Message: (Move.) Queue Live Deferred Retry Message (no thread available): USERID (FID)

11:28:38 27B (Move.) Receiving Inventory List: USERID (FID)
11:28:38 27B (Move.) Inventory List Received (68): USERID (FID)
11:28:38 27B (Move.) Queue First Deferred Retry Message: USERID (FID)
11:28:50 297 (Move.) Requesting User Data: USERID (FID)
11:28:50 297 (Move.) Queue Live Deferred Retry Message (no thread available): USERID (FID)

Shown at the Post Office Agent during an user move.

There are too few threads to initiate the user move.

In ConsoleOne go into the properties of the Post Office Agent showing this error.
In the Agent Settings increase the number of TCP Handler Threads.