What might prevent Jane, listed as a contact, from signing in successfully?

If Jane is listed as a contact but does not have an associated user account, this would prevent her from signing in successfully. In any system where user authentication is required, each individual needs to have a user account linked to their identity in order to access services or features. Contacts typically serve as points of communication or reference within a system and may not automatically be granted access to sign in unless they have an established user account with credentials.

The other options do not specifically address the requirement for a user account. For instance, having an active status or administrative privileges pertains to account management and permissions but does not compensate for the absence of a user account. Similarly, while local resource access can complicate matters, it is not the primary factor preventing login if there is no user account at all.