A newly created Operations Dashboard that consumes a hosted feature service (both of which are shared to the Public) prompts for an ArcGIS Online user name and password. I've made sure the ArcGIS Online site is set for Anonymous Access and I've tried stripping out the organizational name in the URL. Neither of these actions fix the issue. Here's the URL: Operations Dashboard for ArcGIS
Any insight as to what's going on is appreciated!
If this dashboard is actually shared publicly, I would reach out to support. I tried access your dashboard using the generic url
And I am getting rejected when I am logged into my own ArcGIS Online account. This tells me that something is not shared at the Dashboard Level
I tried searching for the item id in ArcGIS Online and it did not appear.
My conclusion is that Dashboard id:419dfcfe8129410e91153c48efe99f32 is not actually shared and that is why you are seeing a sign in prompt!
Hope that helps!