I was employed at Harvard last year and am trying to access my paystubs in PeopleSoft for tax purposes, but my access seems to have ended.

PeopleSoft access for former employees (with the exception of retirees) ends 90 days after your employment ends, and we aren't able to extend this access. You’re encouraged to print your final pay information before this access ends. If you didn't receive a W-2, you can order a copy at this site: https://oc.finance.harvard.edu/how-to/central-payroll/order-copy-your-w-2.