The new Flexiroam arrangement is actually a broader MC deal. I stumbled upon it a couple of months before Latitude rolled out the change from Boingo to Flexiroam.
You can check your card eligibility here - interesting to hear if any other cards in the article work?
[URL unfurl="true"]https://mastercard.flexiroam.com/[/URL]
There‘s actually a bunch of other offers and promos here:
[URL unfurl="true"]https://www.mastercard.com.au/en-au/personal/offers-and-promotions.html[/URL]
Click through each category and select your card (at the top of the page) to filter applicable offers.
The cash back offers tend to be auto enroll. I received a cash back on my 28° card from IHG NZ recently. I didn’t know there was an offer until I went looking for it after the cash turned up!