renter asking for a W-9

[Tidal Creek]

My daughter has been renting a house for a couple of years. She is about to sublet one of the rooms to someone. The new tenant is requesting my daughter fill out a W-9 so the new tenant’s employer can pay her rent directly from her employer to my daughter. This sounds odd since my daughter is not the landlord, she pays all the rent to the landlord and is renting one bedroom to the prospective tenant. Any suggestions or input is appreciated.