Last night we completed a realm first level 15 mythic keystone, only to have our tank not get the achievement.

Last night after many nights of progressing, we managed to finally complete a level 15 arcway mythic keystone and get the realm first achievement. Except, only 4/5 of our group got the achievement even though we're all on the same server.Obviously, our tank was upset so he submitted a ticket to ask what happened. It turns out that he only transferred to our guild's server on 8/29. There is a 60 day waiting period on realm firsts, and he was on day 56 out of 60. If we waited 4 days, he would have gotten it. To the GM's credit he did try to get him the achievement anyway by requesting permission, but was denied.I get why the rule is in place, but it still sucks for him. I wish there was some sort of warning or way we could have known he was ineligible short of calculating that he transferred 56 days ago. We're not on a super competitive server, so we could have easily waited the 4 days.edit: Forgot to mention the biggest point - you don't even have to be on server anymore to get this achievement. If he had simply still been on his old server he would have gotten the achievement with us. The only way he was ineligible to get this achievement was if he transferred, which makes absolutely no sense anymore.