No, coupon codes issued directly by MIT xPRO staff and support cannot be used to purchase courses offered by Emeritus or any other partner. Please see the FAQ article: I have a discount code, which courses can I use it for? for a detailed list of which courses and programs accept MIT xPRO coupon codes and which do not.
For more information about MIT xPRO courses and programs delivered in collaboration with our partner Emeritus, please refer to the FAQ article: What are MIT xPRO Courses and Programs Delivered in Collaboration with Emeritus?