Because Autodesk has moved toward a sign-in-based licensing model, many users no longer need to enter a serial number manually. However, if you are prompted for one, you can find it using these methods:
Check your inbox for a message from Autodesk (often titled "Fulfillment Notification") sent at the time of purchase.
For AutoCAD 2024, the standard product key is . This code is required during installation and activation to distinguish the standalone software from other versions or suites. Serial numbers, unlike product keys, are unique to each user's license and must be retrieved from an official Autodesk Account or fulfillment email. Retrieving Your Activation Details