The accord acts were developed jointly, and they require joint support. They are meant to be jointly governing this area, the offshore area. That commitment was made legally between Canada and Newfoundland and Labrador and between Canada and Nova Scotia. In order to change the obligations that one or other party has or the way in which things are done, it requires agreement on the part of the province and the federal government.
On January 29th, 2024. See this statement in context.