Cancelled and expired subscriptions are not reactivated when updates are made.

If using the import tool, you will need to gather your data by pulling a Subscriptions export. If you would like to update all subscriptions, including active and inactive, use the Subscriptions - All export. 

If you would like to update just inactive customers, use the Subscriptions - Cancelled and/or Subscriptions - Expired. 

It is recommended to include cancelled subscriptions in bulk updates to ensure the updates are in place if the customer reactivates.