I can reproduce this by logging in to an enrolled device (on Linux) and attempting to open the network section of the status tray.

FATAL:network_icon.cc(640)] Check failed: false. Request for icon for unsupported type: etherneteap
#0 0x7fa9c472c55e base::debug::StackTrace::StackTrace()
#1 0x7fa9c474365a logging::LogMessage::~LogMessage()
#2 0x7fa9c6638b17 ash::network_icon::GetImageForNetwork()
#3 0x7fa9c67470f7 ash::NetworkListViewMd::UpdateNetworkIcons()
#4 0x7fa9c6746c38 ash::NetworkListViewMd::Update()
#5 0x7fa9c672ffd1 ash::tray::NetworkStateListDetailedView::Update()
#6 0x7fa9c6730447 ash::tray::NetworkStateListDetailedView::Init()
#7 0x7fa9c66d21f7 ash::TrayNetwork::CreateDetailedView()
#8 0x7fa9c664da9c ash::SystemTrayBubble::CreateItemViews()
#9 0x7fa9c664d682 ash::SystemTrayBubble::UpdateView()
#10 0x7fa9c664b363 ash::SystemTray::ShowItems()
#11 0x7fa9c664b6d2 ash::SystemTray::ShowDetailedView()


We should not be including Ethernet EAP in the list of visible networks. This appears to only occur with the Fake implementation.