Hi @Aprajita
" Trainees are not employees, the Supreme Court has ruled that they are not entitled to provident fund. Trainees , who are paid a stipend during the training period, have no right to employment, and it is for the employer to offer or not to offer a job to them, it said." Considering this they are not a part of PF.
But once they are onboarded as Probation employees and fulfilling the PF criteria, they are eligible for the same.