I am trying to ship to a university and ship to the below address:
Walla Walla University
Department of Technology
306 SW 4th St.
College Place WA 99324
I get the error:
Endicia server returned error: Unable to validate Ship To address.
Error: Address is too ambiguous. 
When looking this address up with various mapping software packages such as google maps, I see no corrections that need to be made and I see that the address is valid.
Why do I have an error that prevents me from shipping to this customer?