It works differently to Amex Global Transfer.
I had to set up a checking account by attending in person at a branch. Was advised after that account had 6 months of good standing,I could then apply for a CC under the International program. This was in 2016 and the rules change regularly.
I befriended the ‘banker’ who set up my checking account to facilitate my application remotely and used my AU address for everything. I was approved shortly thereafter.
I’ve tried a few times to get a ‘Credit Line Increase’ (CLI) but instantly declined. Was originally told they would be assessed based on Citi’s internal records for the conduct of my new CC. It appears it needs a credit file which I’m now establishing having set up a US Amex via global transfer. I’ll make a new application in about 6 months once get some activity through from Amex.