Long time U2 fan, and paid member of fanclub, but first time contributor here.
Maybe a little tip for everybody. Bought 2 tickets GA for O2 London october 30th. Then tried the same code for Amsterdam and managed to pull out two tickets for september 8th. Seems ticketsystems for different countries aren't corresponding with each other.
I don't think that's how it works. Did you buy both through Ticketmaster? They will be putting a delay on sending out the tickets in order to make sure no one double-dipped.
At least, that's my understanding.