Cannot Create Vendor User Group

I am using MV Plus and I would like to activate separate checkout functionality. The add-on Direct Customer-to-Vendor Payments and the addon Vendor Privileges is activated.

To create Payment Methods for vendors, it is required to create a user group type called "vendor" so as to give this group appropriate permissions. But I am unable to create this type of user group. Available types are only "Administrator" and "Customers". How can I activate or create the type "Vendor"?

This issue has been resolved. Although I've activated the add-on "Vendor Privileges", it was still disabled. Now it's working.