One user is receiving an error message when going to a timesheet:
Release: CODFSS99000-15.4.1-PPM SAAS FedRAMP-Sandbox-Small Environment
Compare the impacted user's Access Rights with those of another user with working access.
In this example, we found a user in the same Group and they had Access Rights "Resource - Enter Time."
This was missing from the impacted user's account. They gained Timesheet functionality when this was added.