As a recap, bookings for flights and hotels made on Expedia from now until 31 Mar 2018, for your travel anytime from now until 30 Jun 2018, can earn you 6 mpd, if you use your UOB PRVI Miles card.
As per the terms and conditions, the following qualify as eligible bookings:
Notice that SilkAir has been removed from the list. Previously, both Singapore Airlines and SilkAir were included in the list. When Singapore Airlines was removed, it was still possible to ticket yourself on a Singapore Airlines flight and earn 6 mpd, provided that it was a codeshared with a SilkAir flight.
Now, given that SilkAir has been removed from the list, it is no longer possible to earn 6 mpd on bookings with SIA Group carriers via Expedia, when you use your UOB PRVI Miles card.