Hi,
I've been looking for D class upgrades on some upcoming trips and set up Upgrade Alerts in Expert Flyer. I got an alert for one of them, checked on EF and it showed 3 seats in D (I need 2), tried to upgrade online but got "no seats" available, called Emirates and they confirmed this.

I'm pretty new at this, is this a regular occurrence? I did check EF, still showing 3 available. I also triple checked I've got the right dates, flight numbers etc.

Many Thanks,

Mike