All I can tell you is that when I had zero miles in my UA account (a dormant account I have not used for like 5 years) I only got the 40K offer.

When I linked my CO account to the UA account, and transferred a token number of miles - so that my UA account now had all of 46 miles - I then got the 60K offer.

I conclude from this that the UA account needs some miles in it in order to get the 60K offer to work - YMMV naturally.

Try www.points.com - they used to give 100 miles when you signed up into your chosen FF program. No idea if this still works, but the miles did post very fast as far as I remember. And as suggested above, I think dining miles post in a short time. Good luck.


ADDED: Forgot to mention - I used Firefox browser rather than IE browser which may or may not have made a difference - but even with 0 miles, could be worth trying different browsers.