The Duke and Duchess of Sussex have touched down in Sydney ahead of their first official trip to Australia as a couple. Prince Harry and Meghan will begin their official duties tomorrow with a visit to Sydney Harbour, Admiralty House, and Taronga Zoo. The tour coincides with the Invictus Games, the sporting event founded by Prince Harry which gives injured service personnel and veterans a chance to compete in a variety of sports. The event is expect to attract more than 100,000 people.
Both Prince Harry and Meghan have visited Australia in the past, but never as a couple
"first official trip to Australia as a couple" is the only statement to this effect in the context and does not demonstrate this fact one way or another.  Therefore this cannot be determined from context.  The system is confused because it contains a strong negative affirmation (Never as a couple), which is actually a correct statement but appears to trigger an incorrect result.
( z1 contrast :ARG1 ( z2 visit :ARG0 ( z3 and :op ( z4 prince :name ( z5 name :op "Harry" ) ) :op ( z6 person :name ( z7 name :op "Meghan" ) ) :mod ( z8 both ) ) :ARG1 ( z9 country :name ( z10 name :op "Australia" ) ) :time ( z11 past ) ) :ARG2 ( z12 visit :polarity - :ARG0 z3 :ARG1 z9 :prep-as ( z13 couple ) :time ( z14 ever ) ) )