40015: Invalid device ID

The device ID supplied for a push notification operation was missing or not in an acceptable form, so the request was rejected.

What you should do

Send a valid device ID with the request. The id in the DeviceDetails object must be present and a string. Correct it and retry. See push notifications for how devices are registered.

Why it happens

The device ID supplied when registering or updating a device for push notifications was missing or not a string, so the request was rejected.

What you'll see

The error is reported with code 40015 and HTTP status 400. The message is typically Invalid deviceId.