Actually, there is ‘emergency requests’. You need to be flying for more than 30 minutes or an hour though. And you need less than 30 minutes of fuel. Please be aware that IFATC put their time in for you, they care trained and I doubt they lost you, they were most likely setting up a new arrival pattern, or just following the one already in process.
You may have been given “not accepting aircraft at this point”. This is because you departed from a nearby airport, or made an attempt at flying out of Dublin and back in with very close proximity.
IFATC are trained professionals, I doubt they forgot you, but everyone makes mistakes, we all need to cope with that.
And as pointed by @8SmartFlying, Dublin wasn’t on the schedule yesterday, I think you meant recently. If it was the Training Server that’s out of our hands and is to be honest ‘what you see is what you get’.