Woke up this morning to discover the WMTS-backed basemaps (http://utah.maps.arcgis.com/home/item.html?id=38a765a1306e4ba3804c0faaeede95e0) we share out to the entire state are blank. It looks like adding WMTS services in classic ArcGIS Online web maps just results in a blank layer.
WMS services work fine.
WMTS services work fine in Map Viewer Beta and ArcGIS Pro.
Is this related to the September AGOL update?