Sixty days before your membership expires, you will start receiving email reminders to renew your subscription. In these reminder emails, click the renewal link. If you don’t receive these emails and are concerned that your subscription is about to expire, please contact us. Alternatively, go to the Azure Dev Tools for Teaching - Renew page, and complete the renewal process. To check the expiration date of your subscription, go to the Microsoft Azure Dev Tools for Teaching Management Portal, and look under Subscriptions.
https://azure.microsoft.com/en-us/education/institutions/dev-tools-for-teaching-faq/
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