If your advertiser needs the device ID for both systems: iOS and Android, you'll need to set the parameters for them in the "Tracking" tab of your Advertiser details.

Go to the Advertiser Details Go to "Edit Advertiser" > Tracking > Click on "Add" > Left side: device_id > Right side: #iosidfa##androidadv#

Note: It's important to write the two parameters together in one line, otherwise the tracking will not work properly!