Looks like NAB changed the T&Cs again. I can't find any mention in the T&Cs that states your eligibility to earn bonus points is based on when you last physically earned points., rather than when you last held the credit card.
Only this on the main NAB Credit Card website:
"Bonus points are not available to customers who currently hold, or have held, any personal NAB Qantas Rewards Credit Card in the last 24 months."
Learn about the NAB Qantas frequent flyer rewards program. Discover the available rewards, which transactions earn points, and the terms and conditions of use.
www.nab.com.au
I stopped using the NAB Qantas rewards credit card in July 2024, requested the account to be closed Aug 2024 and switched to the ANZ FF Black Aug 2024, however there was an issue with the NAB credit card that showed 11c credit for nine months after I requested the account to be closed.
Checking the last statement relating to that credit card account shows a statement period for August to Sep 2025, with zero balance and zero transactions.
I do have a letter from NAB confirming the account was closed at the end of August 2024 but the above complicates things so I contacted NAB directly and they confirmed the 24 month period is from when the credit card was closed so I should be able to earn the bonus points if I open a new credit card from Sep 2026 onwards.
I'll most likely switch to the The Qantas American Express Ultimate Card in July 2026 before moving back to NAB in 2027 just to be on the safe side.