Subscription became suspended automatically.
The subscription suspended as its expiration date passed.
Activate subscription under Plesk > Subscriptions > example.com > Activate.
Set the correct value for the subscription's expiration date. This parameter is configured under service plan of subscription under Plesk > Service Plans > Service Plan > Resources Tab > Expiration date.
Also, this parameter is configured under on subscription level under Plesk > Subscriptions > example.com > Customize > Resources Tab > Expiration date .