Hi All,
We are aware that duplicates of the same device are showing up in Alexa. This affects all users of Alexa Skills built by other partners, as well as SmartThings. However, we understand that these duplicate devices are acutely noticed by SmartThings users transitioning from the legacy SmartThings Alexa integration.
Disabling duplicate device instances was not the intended use of the SmartThings device exclusion feature, which is not compatible with our current Alexa integration. We are working directly with the Alexa team to create a more tailored solution for duplicate devices showing up in Alexa.
Thank you for your patience. We are excited to bring you more features over the coming months, which we think will make our new Alexa integration more useful for all SmartThings users!