Axis Ace is being issued in some selected service areas only at the moment.
You can get Axis Ace also if it is coming as a pre-approved if you hold an axis account.
I have an iPhone device - so in gpay it will never pop, though it was there for me on my Liberty account which was 1 month old as pre-approved.
Edit: Try visiting an Axis bank branch and apply offline - if you are not getting Axis Ace card recommendations while filling out their online form.