Time to check the "Benefits" section of your Google One app.
Similar to this deal https://www.ozbargain.com.au/node/707046.
I'm personally on the 100GB plan.
Valid for one $7.00 Google Play credit. Limit 1 redemption per Google One plan. Open to participants whoreceive a promotional code from Google One. Not reloadable; no cash value. Offer ends 31 Dec 2022 and must be added to a Google Payments account by 31 Dec 2022. Once added, credit must be used on Google Play by 30 Mar 2023. Certain subscriptions excluded. Valid in Australia only. Must be an Australian resident, have Internet access on a compatible device and have or activate a Google Payments account, subject to Google Payments Terms. Age restrictions apply. See Promotional Balance Terms and Google Play Terms for more information. Promoter: Google LLC, 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA
On the 2TB and i don't see this :(