I do not believe there's been any policy change on this topic in 2023. What you've experienced has been the case for as long as I've been a member of Bonvoy and SPG before it. Reservations made through third-party OTAs do not qualify for loyalty programme benefits. This is nothing new and it's a loyalty programme policy that I understand is consistent with the other major hotel chains so steaming off to Hyatt tossing your head in the air won't help you. There will be plenty of anecdotes, including perhaps your own, where Bonvoy members have got member benefits on the ground and maybe even points and nights awarded to their loyalty accounts by generous specific hotels but do read the loyalty programme T&Cs on what booking channels constitute a qualifying reservation. You're on safe ground with the app, web site, phone, or direct with the hotel quoting your Bonvoy number.

There's some grey areas to this which does cause understandable confusion and note that I'm using OTA for consumer agents like Expedia, Booking.com etc. as well as other less well-known online portals that your company may use to make travel reservations. Elsewhere, reservations made through a Virtuoso agent will apparently qualify for Bonvoy points and nights. There have been extensive discussions and anecdotes on Flyertalk about reservations made through Amex FHR where pre-paid and pay-at-hotel FHR reservations may be treated differently by the hotel. Corporate rates booked through a corporate travel portal can qualify if benefits are included in the negotiated corporate rate between the employing company and the hotel or not if the negotiated rate excludes them. I'm not an expert on these grey areas so please don't nitpick and it's not the point of my reply which is just that there are grey areas outside the direct Marriott booking channels where YMMV.

The reason is that OTAs get commission from the hotel and it's this saved commission that's paying for your loyalty programme benefits when you book direct. Very understandable from Marriott's and the member hotels' points of view. Indeed, the OTAs themselves have their own loyalty schemes that may be more attractive if you don't want to align yourself with a specific chain. Trip.com has a points system that translates to cash credits while hotels.com gives you a free hotel night for every 10 nights booked through the portal. Clearly you cannot stack such benefits from an OTA with the benefits from Bonvoy nice idea through that would be.

For your scenario, I'd bottom out exactly how your company makes its reservations and confirm with that channel that its reservations are viewed by Bonvoy as an OTA or at least are made using non-qualifying rates with the Bonvoy hotels. Then look at how you can book and pay for your corporate hotel stays yourself in the future so you can guarantee the Bonvoy benefits and also get credit card benefits from the increased spend you make.