Good afternoon and thank you for posting on the Final Fantasy XIV Technical Support Forums.

The 3 day wait period is a little vague for world transfers unfortunately. The system should reset every night at midnight (PST), so even if it's been 72 hours it might not be recognized until tonight. I'd suggest trying again tomorrow and it should allow you to do the world transfer.

We hope we can be of assistance in helping you enjoy the exciting world of Final Fantasy XIV!