ArcGIS Dashboards Map Element - "Cannot Open Map"

[RobertKnight]

Is there any sort of compatibility issue between Map Viewer Classic and (new) Dashboards?

I've set up a simple webmap (using Map Viewer Classic) and am getting the message Cannot Open Map when adding as an element to a "new" dashboard. 

Does the map viewer and dashboard both have to be "Classic" or "New" or is there some other issue?

[RobertBorchert]

Did you share the web map and feature services?

[RobertKnight]

Yes. 

The exact same map opens fine in Dashboards Classic. Seems odd.,

[wholloway]

I'm having the same issue. Dashboard was working fine. could it have become corrupted? did you ever get any resolution on this? 

Also, I have tried to create a new dashboard from the former map, and am getting the same error.