It's in Roku's US Channel Store, but glancing at the Australia Channel Store I didn't see it (I have no idea why search isn't available 🙄). Just because the service is available in Australia doesn't mean the Roku app is. It's up to the provider to make it available in the different regions that Roku supports. It may be an oversight on their part, so you might try contacting iWantTFC.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.
I am not a Roku employee.