The rejection of the delayed applications was reported by The New York Times last week. At least 74 applications from the New York area and Chicago were known to have been rejected as a result of mail problems in Chicago, for which the Postal Service took responsibility. The immigration agency said it was “not responsible” for mail delays.

In New York, lawyers reported that 18 out of 34 applications had actually arrived at the Chicago location on Oct. 5, according to postal receipts, and yet they were not accepted by the immigration agency until the next day.

The Department of Homeland Security acknowledged this in a statement on Wednesday:

“In addition, U.S.C.I.S. had discovered certain cases in which the DACA requests were received at the designated filing location (e.g., at the applicable P.O. Box) by the filing deadline, but were rejected. U.S.C.I.S. will proactively reach out to those DACA requesters.”

Officials from the immigration agency said they were still investigating the cause and location of the problems. Details about the date of the deadline to resubmit applications would be forthcoming, the agency said.

On Sept. 5, the Trump administration canceled the Obama-era DACA program, which allowed nearly 800,000 young immigrants who were brought to the country illegally as children to work and go to school in the United States without fear of deportation. Those whose permits were expiring before March 5, 2018, were permitted to renew their application by Oct. 5 for a two-year period.