Hello Heather,
Make sure that you have the following dbparms set:
NCharBind=1
DisableBind=0
The following is from the documentation for NCharBind:
For SNC, the default NcharBind=1 is recommended for binding Nchar, Nvarchar, Ntext and Nvarchar(max) data. It encodes the string data as Unicode. NcharBind=0 is recommended for binding Char, Varchar, Text and Varchar(max) data. This setting converts the data to the ANSI string determined by the current operating system code page.
DisableBind must be set to 0 For NcharBind to take effect, the DisableBind parameter must be set to 0. DisableBind=1 overrides the NcharBind setting.
Ted Zimmerman