According to The Financial Times, students in the age group 17-19 were hired as interns in September and were told to work at the assembling unit in Zhengzhou, China, to work for three months to get "work experience in order to graduate".
"The work has nothing to do with our studies. We are being forced by our school to work here," Yang who assembles 1,200 iPhone X cameras a day was quoted as saying in the report.
She is among a group of 3,000 students from Zhengzhou Urban Rail Transit School who are working at a local Foxconn facility.
"Apple and Foxconn acknowledged they had discovered cases of student interns working overtime and said they were taking remedial action. But both companies said the students were working voluntarily," the report added.
According to Foxconn, its internship programme was "carried out in co-operation with local governments and a number of vocational schools in China".
Three other Foxconn plants in China were found to be in breach of numerous health and safety regulations, exceeding working hours, five years ago, Th Guardian reported.
After facing a lacklustre response to iPhone 8 and iPhone 8 Plus globally, including in India, Apple placed its bet on successful delivery of "super premium" iPhone X.
However, several media reports claimed that Apple is facing a huge supply gap primarily for two reasons: difficulties in assembling the new facial identification software and 3D camera, and "off the charts" pre-orders for iPhone X after the Apple fraternity didn't make the expected beeline for iPhone 8 and 8 Plus.
Analysts had warned that the stock on hand is scarce, owing to constrained supply of key iPhone X components.
The iPhone X, which marks the 10th anniversary of the device, costs Rs 89,000 for a 64 GB model and Rs 1.02 lakh for the 256 GB variant.