[scarface_74]

https://frequentmiler.com/hilton-honors-complete-guide/

> Elite nights are not earned with online travel agency bookings. For example, if you book through Expedia, you will not earn elite night credit (or points) for your stay. You also might not receive elite benefits during your stay, but some hotels have been known to offer them anyway as long as you add your Hilton Honors membership number to the reservation.

Yes this is different if you use a portal like Concur used for business travel. You can even put your personal loyalty code in and it shows up automatically -- at least through Hilton and Delta.

[partdavid]

Through the big vendors--probably, and it might depend on who your travel agency is (Concur generally isn't it, although they have some kind of default travel processor). But I've noticed that it's not universal with smaller hotel chains, they just won't do it.