Has anyone used the Fast Formula function GET_MESG?

Summary:

Content (required):

We tried using this in our Benefits Postelection Edit FF, but the end result is not what we expected. I'm attaching the message configuration as well as the message output.

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

ERROR_MESSAGE = GET_MESG('BEN','IUH_POST_ELECT_FF026_MSG_1','TOKEN1','PlanA','TOKEN2','PlanB')