Naresh Patre
Ansys Employee

Hello Robert Wright

Thank you for sharing the details through email. I went through them and the error is mentioning about failure over Mechanical license. I checked your account and you have Discovery license and Discovery Fluids Physics Add-on license. So, if you are trying to perform any structural analysis in the Refine mode of Discovery , you will get this error. Structures Add-on license is required for performing structural analysis in the Refine mode. 

Please let me know if this explains the reason behind the error message that you are seeing. Let me know if you have any questions.