
The error can appear if you are trying to use your Subscription ID to activate through Serial Number activation. Solution: To avoid this error, use one of the following:

AutoCAD LT 2016 activated using the AutoCAD LT 2016 serial number, but attempting to reactivate it using the Inventor LT Suite 2016 serial number.AutoCAD 2016 installed using the Building Design Suite 2016 installer, but attempting to activate/reactivate it using the AutoCAD 2016 serial number.Serial number does not match media or initial activation information An “Invalid serial number” error may occur if the serial number used for activation does not match the media used for installation. The subscription license has lapsed or been canceled.The product has been returned through a reseller or the online store.Check the previous version eligibility list.) (This can also happen if with an active subscription contract. The product has been upgraded to a different product.(Active subscription contracts have previous version benefits, so this does not apply to them.)

