A program that grants points for using Bing search, which users can redeem for gift cards, sweepstakes entries, or charitable donations.
Hello, I understand your concern.
You can still enter or join the sweepstakes as you are legally residing in Australia even if you are on a temporary visa and in the event that you will win, you can check and submit a ticket
via https://rewards.bing.com/support for this to get checked internally by the rewards team. Response times may vary due to workload or other tasks at hand, but rest assured that they will review your case and let you know on the outcome.