The IRFU insist all 224 wheelchair-accessible tickets were sold for Ireland's Six Nations clash with France over the weekend.
A photo shared online showed a number of accessible seats empty during Saturday's match, but the IRFU say this was due to people with tickets not turning up.
In a tweet on Saturday night, Jack Kavanagh, who uses a wheelchair, said he was "incredibly frustrated" to see images of empty spaces having been put on a waiting list for tickets to the match.
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Ian St John, who also uses a wheelchair and has been trying for years to get tickets, commented on the post saying he had been told months ago that they were all sold out.
Minister for State Anne Rabbitte said the empty spaces were "unacceptable".
She tweeted: "Accessibility cannot just be a tick the box exercise @IrishRugby.
"This isn’t just disappointing, it’s unacceptable. People expect more and deserve better."
Responding to the criticism online, the IRFU said in a statement: "We’re aware that a number of supporters who were allocated seats in all categories of the stadium didn't turn up. This is not unusual for any fixture due to ill health, transport, travel etc.
"It is our priority to get as many supporters into our matches as possible - and every attempt is made to reallocate or resell seats once enough notice is given."
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