Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
You are out of luck.
The hotel is not obliged to accept points stays after it deflags, and Hyatt is not obliged to pay for you to stay at a non-Hyatt hotel.
Hyatt has no other hotels to offer you in Osaka.
Either you make a cash reservation at this hotel or you make alternative arrangements...