This Error comes up because I have activated Alexa Notification but not using the default data point of an Alexa device. This is why the adapter is missing the data point "speak-volume" in same path.
This should at least not be an error but a warning.
Maybe it would be good to have a custom notification channel in addition to Alexa, WhatsApp, Telegram and so on or the possibility to deactivate the "set volume" function maybe with giving "0" for volume.
This Error comes up because I have activated Alexa Notification but not using the default data point of an Alexa device. This is why the adapter is missing the data point "speak-volume" in same path. This should at least not be an error but a warning. Maybe it would be good to have a custom notification channel in addition to Alexa, WhatsApp, Telegram and so on or the possibility to deactivate the "set volume" function maybe with giving "0" for volume.