AutoCAD 2017 activated using the Building Design Suite 2017 serial number, but attempting to reactivate it using the Architecture, Engineering and Construction Collection serial number.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.) The serial number has been upgraded to a new release.The serial number does not match the media (or product key) used either during installation or during initial activation of the product.The serial number is for a network license rather than a stand-alone license.The license changed from serial number to 'Sign In' without serial number.

Causes:There are several reasons this message may appear during an activation, including:

Serial checksum error