Apparently this has been discussed at the Balmoral summit: an act of parliament to remove Harry and his heirs from the line of succession as they are no longer U.K. residents or working royals. Makes sense to me - I doubt many people would object. Don’t the Swedish royals have a similar rule? They only keep their titles & place in succession if they live in Sweden? Handy precedent there.
www.dailyrecord.co.uk/entertainment/prince-harrys-position-line-succession-33518669.amp