Thanks for the update on Hilton. I'm booking a FHR trip for May 2021 now.
Pre-2020 (since I have not done any fun travel this year) I have not had any problems with Hilton in earning points via FHR postpaid. I usually call Hilton to get my HH number registered with the reservation and has never been a problem. Marriott reservations do show up on my account but I have had multiple issues with my stays in Asia earning Marriott points. I've always needed to contact an agent. Again this is all post-paid, I have not done prepaid.