Today all users in my organisation are unable to access Web Layers in Web Maps on ArcGIS Online. Via the Map Viewer, Collector App or ArcGIS Pro you can browse the Web Maps in our organisation, the map will open but without layers. When you try to access the layers directly it either prompts for additional credentials or it fails directly.
The same issue occurred on the 12 of march 2020. It lasted for some hours after it resolved.
Are there known server issues at ESRI at the moment? Or is there additional maintenance ongoing?
Ah, that makes sense. Sorry I didn't realize the time delay!
Best of luck, and hopefully the issue resolves soon!