I’ve just called in and have been told that if you don’t attach the e-certificate to a redemption stay before 5th March and the hotel category goes up, you have to pay more points. This is ridiculous as it defeats the whole purpose of having the points advance option.

ThePointsGuy said Marriott will honour points advance bookings at the original rate:

https://thepointsguy.com/guide/marri...CPVSmAxVp68VqA

Can the lurkers confirm this?

Thanks.