Register a supplier without checking the request create user account?

Summary:

Business requirement: Roll off supplier portal to selected suppliers only.

Content (required):

Supplier registration won't proceed unless I add one active contact with request create user account, however business don't like all their supplier to have access on the supplier portal.

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

23C

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