If you haven't solved this problem yet then, please compile your ABM application ONCE in the Debug mode and then see whether your problem is solved or notStill no go, I can't seem to make it work…
Material icons seem to be more suitable for Mobile versions, but when targeting Desktop as a main viewing device, the FontAwsome e much more suitable...
So Please!!!! HELP
loginButton.IconName = "fa-sign-in"
loginButton.IconName = "fa fa-sign-in"