"Under the mandate, the Crown accepted there is no solid recognition for hapu within the structure. Another issue is that the process was flawed and there were multiple concerns raised by claimants and whanau over a number of years regarding the mandate strategy itself and the [NTB] as well as the Crown failed to recognise those issues," she said
Haydn Edmonds, chairman of the NTB, said it was inappropriate for the board to comment at this time.
It is not the first time the Crown's recognition of a deed of mandate has led to an urgency hearing.
Ms Lyndon said parallels could be drawn between the Crown's recognition of the Tuhoronuku mandate, which is now under threat, and its recognition of the NTB's deed of mandate.
"I'm equally as Ngapuhi as I am Ngatiwai ... I think it's timely, and it's a warning to our various hapu around the country that we need to learn from what [is] happening within Ngapuhi to find a way to be cohesive and work hard to hear our people's voices."
Claimant Mylie George, from hapu Te Uri o Hikihiki, said the NTB's mandate was not current.
Of the 2735 voting papers that were issued about the mandate, 772 votes were cast, a 28.2 per cent participation rate.
Of these votes, 82 per cent were in favour of the Ngatiwai Trust Board's mandate proposal.
An online petition by Ms George and other whanau showed more than 600 people have agreed the mandate does not support hapu rangatiratanga, she said.
Ms George hoped the hearing would pause negotiations.
"What our family is looking to do is to pause the current mandate, to stop it because there's lots of work that needs to be done."