A statement released to the ASX on Monday morning blamed the poor take-up on tightened border restrictions and the COVID-19 outbreak in Melbourne.
The Northern Territory has opened its borders up to interstate travel – but Victoria and Greater Sydney residents are excluded.
Prime Minister Scott Morrison said the decision was “in the national interest” and would also include a review of the isolation procedures.
Chief executive Stephen Byron said, “Canberra has not had any COVID for 17 days. And Queensland and South Australian premiers don’t want to open up to places where there is COVID.”
Premier Steven Marshall has hinted he could take a more lenient approach with NSW and the ACT, who have fared better in restricting community transmission.