Layer transparency isn't working on Windows and Android devices. We can set the transparency in AGOL and it will work but this applies to the entire map service we've added, we want it to work on individual layers.
Specific devices used:
Android phone: Moto G (3rd Generation) and the OS version is 6.0.
Windows phone: Nokia Lumia 735 and the OS is Windows Phone 8.1 Update 2