Unable to add layer - ArcGIS Server web service - Map viewer (new)

[AidosMalybayev]

Hi,

I have a map created a while ago in map viewer (classic) with public ArcGIS Server web service layer.

I wanted migrate this map to map viewer (new) but when I open it an error message pop-up:

• in map area

"Unable to add layer [layer name]
The layer, [layer name], cannot be added to the map."

• in Layers (below greyed out layer)

"An error occurred loading this layer"

So, this layer opens normally in classic but not in new one.

Any idea?

Thanks,

Aidos