Every single student employee at Parks Canada this past summer experienced pay problems related to the federal government's Phoenix payroll system.

The agency confirms that all 1,659 student workers were improperly paid between July 11 and Aug. 26.

"At that time, all 1,659 students had one or more reported pay issues," said Natalie Fay, chief of media relations at Parks Canada.

CBC News first learned about the troubling statistic after obtaining a series of weekly updates on Phoenix through an access-to-information request.

Since Phoenix was rolled out, more than 80,000 public servants have been overpaid, underpaid or not paid at all.

An email obtained separately by CBC News provides some context about the kinds of pay challenges student workers faced.

"Phoenix would automatically input students at the lowest possible pay level," Jesse Fleming, chief of staff and corporate secretary at Parks Canada, said in a message to Kyle Harrietha, director of parliamentary affairs and issues management at the environment minister's office.

"This was a systemic issue with the software," Fleming wrote, which led to students being paid at the wrong rate.

The July 11 email says the rate issue was corrected, but other problems emerged, including "administrative errors by students or Parks [Canada] in filling out paperwork, technical issues within Phoenix, [and] extra duty pay not being treated as a priority by [Public Services and Procurement Canada]."

Parks Canada was working with the students and PSPC "to resolve these issues both on a systemic and case-by-case basis," Fleming wrote.

Slow resolution

A PSPC spokesman said assistance was made available to the Parks Canada students.

"Like all federal employees, students had, and continue to have, access to emergency salary advances," Pierre-Alain Bujold told CBC in an email.

The weekly briefings also show a slow resolution of issues for some student workers. After six weeks of no progress, nearly 150 students had their problems fixed by Sept. 2.

The number of outstanding cases continued to shrink until the week of Nov. 4 — the last briefing obtained by CBC News. It shows 475 students were still experiencing problems at that time.

PSPC said it is currently aware of 51 student cases from Parks Canada that are still open and need to be resolved.