Rhino keeps asking me to validate when I click the render

Rhino asked me to validate when I click the render button when I have already validated previously. I can use the 3d program, but cannot use the flamingo render. When I go to the validation website and input my product key, it’s saying my license key is invalid. Can anyone help me with this?

Changed category. Perhaps @scottd can help

I would say contact sales@mcneel.com or your reseller to find out what’s going on with your license key…