If you have a current subscription, pressing Restore should activate the subscription.

(if you are a tester as in you install ezccs from TestFlight click here)

Apple tracks your subscription using your Apple ID. I have no access to subscription information. ( if you are using the app on a device that doesn't use the Apple ID with a subscription, perhaps a United iPad, see the FAQ titled United iPads)Check you have the current Apple iOS for your device. Apple has been updating frequently. Look under Settings->General->Software Updates. Having the current/correct iOS resolves most subscription issues.

Troubleshooting:

The first thing to try is double touch the home button on the device and reboot the device.

Next verify your subscription using this:

https://support.apple.com/en-us/HT202039

If you have a current subscription, pressing Restore should activate the subscription.

If you have in app purchases restrictions turned on this can block the subscription.

https://support.apple.com/en-us/HT204396

I have noticed that a bad data connection can also cause issue with the subscription. You might try on WiFi.

In some cases it is necessary to delete the app and re-install it.

(Users have been ignoring the advice below, much to everyones discomfort. The subscription system is not mine, it's Apple's and sometimes it just needs a reset. please do not ignore the steps in this FAQ. Each steps is here for a reason.)

In some cases you need to sign out of your Apple account and sign back in. Settings->iTunes & App Store.

If all else fails, send me your uID and a screenshot of the subscription from the device ( from the screen where you verified your subscription from earlier). I can send you a code to bypass the subscription system.

Turning off Screen Time may also fix a Subscription issue. Specifically when in-app purchases are blocked.

If you see this message Apple is telling you exactly why the subscription will not restore. You have to delete and re-isntall the app whiel logged into the correct Apple ID. Use the BACKUP/TRANSFER option in ezccs if you want to save you data including the contact list.