Since the release of AutoCAD 2021, Autodesk has transitioned away from the traditional Serial Number and Product Key model in favor of Named User subscriptions AutoCAD 2023 , the software is activated by signing in with your Autodesk ID
For modern subscriptions, this is generally replaced by your Autodesk Account login. If your specific license still uses one, it will be listed under the "License Details" tab of your product in the account portal. 2. How to Locate Your License Details --- Autodesk Autocad 2023 Serial Number And Product Key