Join Date: Aug 2011
Location: Barcelona, London, on a plane
Programs: IB+ Gold, TK E+, Hyatt Globalist, Marriott LTP, IHG Diamond
Posts: 14,170
The hotel needs you to cancel because you spent points. Hotels can't just go around cancelling award stays...
I have my doubts that the SLH stay will be booked in a way that gets you the elite night credit. But worst case scenario - assuming that WoH doesn't add your elite night later - is you take the money saved from your totally free night and just mattress run another Hyatt during your challenge.