If you are using a specific version or suite, the key may differ: AutoCAD LT 2023: AutoCAD Architecture 2023: AutoCAD Mechanical 2023: Autodesk Community, Autodesk Forums, Autodesk Forum Finding Your Serial Number

. Autodesk has largely moved away from manual serial numbers in favor of this named-user model. Autodesk Community, Autodesk Forums, Autodesk Forum How to find AUTOCAD 2023 Product Key for Student Version

For digital purchases or student versions, the serial number is typically sent in a "Fulfillment Notification" email from Within the Software: