Skype is no longer able to support some older subscriptions.

An email notification was sent on November 13th, 2017 to the email address associated with your Skype account. If you have been impacted and your subscription contained a Skype Number which you want to keep, please renew it on https://secure.skype.com/portal/main-page?page=onlineNumber. You will need to purchase it as a new separate subscription. 

If you are unsure whether you have been impacted, go to https://secure.skype.com/portal/overview and see your subscription status.

If you want to continue making calls using Skype go to https://go.skype.com/prices and pick a subscription that fits your needs.

If you have further questions, please contact Skype customer support.