Your warranty includes your InControl 2 subscription, which now also has expired.
Since your InControl 2 subscription has expired, your device is no longer reporting to the InControl 2 cloud and deemed offline.
Now that your warranty has expired, you cannot buy the standard extended warranty anymore, since this can only be bought while the device is still in warranty.
You will need to purchase a SmartCare license, which reactivates your warranty (this also includes a new InControl 2 subscription).
For some Peplink/Pepwave products you can buy a license for just InControl 2, which is much cheaper than SmartCare.
Are we talking about the Peplink Balance One?