Around 15,000 applications for the COVID-19 unemployment payment have been rejected for a range of different reasons, according to the Social Protection Minister.
In some cases they did not meet the eligibility criteria, while others may have given incorrect details that need to be corrected.
Thousands of duplicate applications were also received, as some people made an online and physical application.
It comes as tens of thousands of workers who've been temporarily laid off received their first €350 per week payment today.
Social Protection Minister Regina Doherty told The Hard Shoulder her department is working flat out to process the applications.
She said: "As of the close of business on Friday, we had some 289,000 people that had made an application - the application had been processed and put into payment. All of those people would have received a payment into their bank accounts this morning.
"There are about 15,000 people who didn't get a payment today, for a number of reasons.
"Anyone under 18 or over 66 doesn't get this payment... and there were a number of people who had either put down their PPS numbers and we couldn't read them, or put down the IBAN numbers and they just didn't work."
She said her department will be contacting anyone whose details weren't correct in order to resolve the issues.
Minister Doherty also confirmed the COVID-19 payment won't impact workers' PRSI contributions - for people who return to work after the crisis, there will be a 'continuity of service' as if they hadn't left.
She explained: "That's not the way it would normally be, but nobody has chosen to be out of work for this crisis.
"A lot of people closed down because they had no customers, and a lot of people have closed their businesses because we asked them to."
She also assured people that they will receive their 12 weeks' payment, even if they did not receive two weeks' worth of payments today.
Earlier, Minister Doherty also confirmed the fuel allowance scheme would be extended by a month due to the coronavirus crisis.
