TL;DR - Please contact your account manager (you can find a contact in the Customer Portal or contact firstname.lastname@example.org directly). They should have contacted you about renewing the license well ahead anyways, so it might be that you have an email from them somewhere in your mailbox.
Why is my license expiring?
There are two common cases for licenses to expire:
Reason 1: Awaiting payment
We issue licenses with a limited expiration date right after the contract is signed and then issue full-length licenses after the invoice payment has been received. You can check the status of the license on the "Your home" screen in the Customer Portal. If you have sent the payment already and the license has not been updated, please contact your account manager or email@example.com.
Reason 2: DXU/Subscription licenses
Licenses allocated as part of the "unit" licenses (DXUs) are set to expire after the subscription term ends (typically 12 months). After renewing the subscription term, you will be issued a new set of license keys for the next term. You can check the term for each license (Expiration Date) in the Customer Portal. If you have sent the payment already and the license has not been updated, please contact your account manager or firstname.lastname@example.org.
In your Customer Portal account, on the main page, you can see your current CloverDX plan including the plan expiration date. If the plan is about to expire soon, the term is displayed in red color (highlighted for you). You can click the "Contact account manager" link right next to it which will get you to a contact form.
What are "Maintenance end" and "Expiration date"
For Legacy/perpetual licenses, the CloverCARE maintenance end represents the term when your CloverDX support package is active. CloverCARE entitles you to technical support and upgrades for the product and needs to be renewed annually - you'll find more in the terms of your contract. If maintenance ends for a perpetual license, you can continue using the product. You can only download product upgrades released during your active maintenance period.
For DXU/subscription licenses the CloverDX support package is always included and lasts for the subscription term and renews with the license itself.