Send Message error with NAMEWITHLEADINGUS

[Rick Sample]

I am testing my Wf on another client.
When I get to any messages of 'WI for self method' like below:
SELFITEM - SENDTASKDESCRIPTION
AddressStrings          &ZREJECTEDBY.NAMEWITHLEADINGUS&
 
It errors out:
Work item 000000003026: Object HD0130    SELFITEM
000000003026 method SENDTASKDESCRIPTION cannot be executed
 
I go to the container, take out the 'US', restart after error, and it
sends.
I am stumped!