Hello,
Unfortunately, we cannot help you with this problem. Since we do not support directly the Alexa demo. However, I am aware that the sensory license is not currently supported in the i.MX8MQ for the reason that the libraries were made for a 32 bit processor and the i.MX8MQ is a 64 bit processor. Actually, I think that at the time you are building the image, there is a text where it says what I told you.
I apologize for the inconveniences this could give you.
Best Regards,
Diego.