Supplier Roles not available when attempting to create a Supplier Account

Summary

Supplier Roles not available when attempting to create a Supplier Account for an existing Supplier Contact

Content

When attempting to create a user account for a supplier contact- specifically after checking the "Create User Account" checkbox and selecting the Actions > Select & Add on the Roles tab, no Supplier roles are available to add. 

On the Manage Supplier User Roles task in the FSM, the following roles are listed with the "Default for Supplier Portal" checkbox selected:

-Supplier Self Service Administrator, Supplier Accounts Receivable Specialist, Supplier Customer Service Representative, Supplier Inventory Manager, Supplier Sales Representative

How can I make the roles available for selection so that I can assign them to the user account and create the account?