Cannot embedded ramdomised ID

@Apple if you are using the API the embedded variable must be appearing in your survey flow before you can add a value to it. So if you are doing random embedded fields then you will need to add the embedded field first (https://api.qualtrics.com/reference#insert-embedded-data-fields) then you can update the value for the embedded field (https://api.qualtrics.com/reference#update-response).