Each marketplace requires users to periodically refresh permission for account links like the one used in the MySales Dashboard.
Click on "Seller Account" in the top right corner of the MySales Dashboard.
Click on the Renew option on the seller account card. You will need to repeat these steps for linking your eBay or Amazon account.
After renewing, the dashboard will continue importing your activity.
If new active listings have been created while the account link to Terapeak was expired, you will need to unlink and relink the account in order to back-fill the missing listing data.