I found the perfect flight I needed SYD-IAH direct on UA, which is showing availabilty on the UA, SQ and AV websites.
I took the plunge and bought 80k points miles then when it came to enter my passenger information it errored out:
Sorry, we could not process your request, please try again.
If the problem persists contact our Call center Option 3 or send us an email to [email protected]
LifeMiles Team.
I added some credit to my Skype account then called their US support line, who said their LifeMiles team will be back online in four hours (it's currently the middle of the night over there).
Have sent a screen shot of the booking screen with my passport to the email address and asked for it to be processed.
Hopefully can be resolved when I call them in a few hours, will be 10:30PM Sydney time which is not too ridiculous I guess.
Appreciate any feedback from anyone who has had a similar experience!
Cheers.