When this occurs, term based license will always get pulled first but I've noticed the same. Certain groups are included and excluded.
SO you need to make sure the users that are in these groups are not being restricted in getting a Inventor Pro license for activation.Autodesk Inventor Professional 2018 for Designers is a comprehensive textbook that introduces the users to Autodesk Inventor 2018, a feature-based 3D parametric solid modeling software.
All environments of this solid modeling software are covered in this textbook with thorough explanation of commands, options, and their applications to create real-world products. The mechanical engineering industry examples that are used as tutorials and the related additional exercises at the end of each chapter help the users to understand the design techniques used in the industry to design a product.