Does Prevent Duplicate Registration work only on email addresses?

I have two individuals that share a same email address. (husband and wife).

Since they register and pay individually, but have the same email address, does "Prevent Duplicate Registration" keep them from being successfull because of an email only comparison (vs. email, first, and last name)?

I don't remember seeing this field in the past so I'm getting new behavior with people sharing emails not getting registered.

Husband can register, but wife, and son cannot with the same email address.

Chris.

Hello Chris

When Prevent Duplicate Registration is On, two different users cannot register for one event using same email address. They will need to use different email addresses for registering

Regards,

Tuan