You must wait for 12 hours and check ETA status later again. If you applied for an ETA through official website, you can check the progress of ETA on the website in 12 hours. If you applied for an ETA through a travel agent, the travel agent should be able to check the status of ETA on their system in 12 hours.
Please do not make multiple attempts to obtain an ETA or contact the Australia Visa & Citizenship office within the 12 hours.
① a copy of your passport's biodata page
② Form 1494 - ETA additional information
③ the date and time you last departed Australia
④ the city and airport you last departed Australia
⑤ the flight number you departed Australia on (provide evidence, for example, a copy of e-Ticket)
⑥ copy of the passport you used when you departed from Australia (if different than your current passport)
⑦ passport pages showing arrival at your destination
⑧ intended travel date
You must wait for 12 hours from the time you applied for an ETA and then check the ETA status at TIETAC screen.
If ETA was granted, you would see ‘OK to board’ message. If ETA was not granted, you would see ‘No visa found’ message. If you found ‘No visa found’ message, please check the detailed message at TIETAQ screen.