Using WMTS Service with API Key - not working

[KobusPItzer]

Hi 

I am currently using WMTS to display satellite data and we used bearer token previously. We are now moving to API Key usage with WMTS and setting the API key with custom params or 

ArcGISRuntimeEnvironment.setApiKey("MY_KEY")
wmtsService.customParameters["APIKEY"] = "MY_KEY"

 is not working. Keep getting authentication errors, such as ""No API key provided". 

What I currently have is 

private val wmtsService: WmtsService by lazy { WmtsService("https://api.airbus.geoint.africa/api/v1/map/imagery.wmts") 
ArcGISRuntimeEnvironment.setApiKey("MY_KEY")
wmtsService.customParameters["APIKEY"] = "MY_KEY"

// create a Map
val map = ArcGISMap()
// set the map to be displayed in this view
mapView.map = map

// display wmts data on the map
wmtsService.addDoneLoadingListener {
    if (wmtsService.loadStatus == LoadStatus.LOADED) {
        // get service info
        val wmtsServiceInfo = wmtsService.serviceInfo
        // get the first layers id
        val layerInfos = wmtsServiceInfo.layerInfos
        // create WMTS layer from layer info
        val wmtsLayer = WmtsLayer(layerInfos[0])
        // set the basemap of the map with WMTS layer
        map.basemap = Basemap(wmtsLayer)
       }
    if (wmtsService.loadStatus == LoadStatus.FAILED_TO_LOAD){
        Log.e("ARCGIS", "Load failed: ${wmtsService.loadError.cause}")
    }
}
wmtsService.loadAsync()

It keeps failing and I get a grid of grey squares from the map view, any help would be appreciated.

Thanks