If your permit application status has changed to 'Expired' then this will mean one of two things;
1. You have reached the maximum threshold of allowed sessions against the permit. With Employee Permits there is a threshhold of 365 full day sessions, 730 part day sessions (five hours) or a combination of the two but not amounting to more than 365 full day sessions. Commuter Permits simply have a threshold of 365 full day sessions. These sessions will diminish over the course of the year as they are used.
2. The lifespan of one year has been reached against your Employee/Commuter Permit; meaning that you will need to renew your original application to continue using the service.