If the device's certificate is not renewed, you can follow these steps to re-enroll device certificate.
Note If the certificate will expire within one day on a device, you receive the following notification:

Note If the certificate will expire within one day on a device, you receive the following notification:

- Open SETTINGS, and then select Company Apps.
- Click the company name. For example, click Contoso Corp.
- Enter the password.
- The status will change from Syncing to Enrolled.