While direct agent support has ended, you can sometimes still use the Autodesk Look Up tool to see if your serial number and product key (001B1) allow for a code generation via your Autodesk Account. 3. License Transfer Utility (LTU)
If you have a legitimate license but cannot activate your software, you may consider the following alternatives: Activation error in Autocad 2010 - Forums, Autodesk autocad 2010 activation code for product key 001b1