National Nuclear Security Administration officials on Friday attempted to notify some employees who had been let go the day before that they are now due to be reinstated — but they struggled to find them because they didn't have their new contact information.

In an email sent to employees at the NNSA and obtained by NBC News, officials sought help contacting former employees who received termination notices late Thursday and lost access to their official email accounts, according to a source with direct knowledge of the notifications.