We’ve highlighted a few of our more popular products below to make it a little easier for you to find your correct Product Key. Entering an incorrect product key will cause activation errors and you will be unable to use your Autodesk software. The issue may arise randomly and without a clear. The issue may be specific to a Revit version, or office location. Specific project members cannot open different Revit Cloud Workshared models in their environment, the program stops responding, hangs, or crashes. It is important to ensure you are using the correct product key for your Autodesk product and version. 066-66666666 666-69696969 667-98989898 400-45454545. Specific project members cannot open cloud models in their environment from Revit. Product keys are required for installation of Autodesk products and are used to differentiate products that are both sold independently and as part of a product suite.