Some of the transportation companies have chosen to opt-out of the ferry card partnership. For example the Norled ferries to Tromsø uses a different ticket system. Therefore you cannot use a normal Norled value card travelling to Tromsø.
This is mostly relevant from Vest-Agder up and including Møre, and Brekstad-Valset in Trøndelag, and Torghatten’s 5 ferry routes in Norland.
Routes included in the partnership can be found at  Ferjekort.no