local user login

I'm using Service Desk Plus 8.0.0 Build 8013.

I created a local user/requester in the Service Desk AD, but cannot log in. I basically left everythig empty except the name, login name, and password.

The problem is that if I enable AD Authentication then I cannot login with the local user/requester I created. However, if I disable AD Authentication then I can log in. But everyone else in my company's domain are not able to login.

The reason why we want a local user/requester so that in case our employees lost/forgot their password, they can still login using the generic local user/requester and submit a ticket.

Is there a work-around to this or another way we can solve this problem?

Thank you in advance.