The call is still an unprecedented agreement between governments and all the major tech companies for ongoing collaboration to make the internet safer.
However the White House will not sign the agreement amid US concerns that it clashes with constitutional protections for free speech.
Prime Minister Jacinda Ardern noted the United States' support for the call's principles.
The US reluctance to sign up was in part mitigated by the commitments of the tech companies that are mainly based there, she said.
Dialogue with the US was ongoing, she added.
The call is the culmination of weeks of intensive work across many government departments, involving thousands of officials to draw up the document and garner global support just two months after the terror attack.
While it is a voluntary framework, it has been given additional heft after an endorsement from 55 investor funds that will use its $5 trillion in assets to push the tech companies to follow through on their pledges.
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