Hey there Huntriixz.
I am sorry to hear this. Playing together with friends is of course a big part why many of us enjoy the game.
I have to be honest though, there’s likely little that can be done as the Free Migration window has already closed for this time. We do our best to put up early notices and clear information on our WoW Classic forums so that people have the time to plan and organize.
It is of course possible it could open again in the future.
That being said, this isnt something that we can look into here on the forums. I would encourage your friend to open up a ticket so that our Game Masters can at least see what options there are. But as I said, it is unlikely this can be changed now.