Yes, please send me a log.
I try to explain the logig is used for selecting and saving devices in device list.
When you open AlarmClock app (web or mobile) the device list is generated and it will contain devices active in this moment. So if your device is unavailable in this moment, it will not included in device list.
But there is one trick.
If this device is already used in one of task, it also will included in device list, even if it is switched off.
And in this case there will be no troubles with saving.
Do you have any real troubles ?
Please explain more detailed and sen log.