Hi @fern thanks for the update. I am afraid that the EyeX SDK has been deprecated since almost 2 years and unfortunately we no longer actively maintain or indeed support this API, recommending customers to use the latest Tobii Core SDK. In this case however, the various calibration functions you are using are not necessarily exposed within the Core SDK. So for the time being, the workaround you found with login property is likely to be the best approach but I will enquire if any of the developers may know of a more elegant solution.