Unable to use refferal link

Hi,
I want to give refferal link for my girlfriend that created account 6 days ago. The link is not working and its saying that it is inegible. According to your articles account has to be no older than 7 days to connect it via refferal link. So according to your rules it should be possible connect them. Her btg Blueeeflower#2663. WoW support was not able to help with this issue.