Just logged in using my telstra account on my TV and noticed the credit. Can use it to rent a movie like 1917 or Dark Waters which are both $5.99. Credit expires one month from signing up.
Telstra TV Box Office Registration Offer
Telstra TV Box Office credit of $6.99 valid for 1 month after registering as a new customer before 30 June 2021. Not compatible with any other Telstra TV Box Office offer.