Basket trader has changed in IB.
I previously used 20221125 11:00:00 EST
(canada)
and 20221125 11:00:00 AEST
(Australia)
This works
20221125 11:00:00 Australia/NSW
20221125 11:00:00 US/Eastern
They are very specific about spaces and capitals.
I also had to click yes to a pop up window for every single share, discussing margin requirements if the position is taken.