Likely related to new AGOL just released, but we have a dashboard that is publicly shared (as well as all items in it). Now when going to it, we get asked to sign in, and that never resolves - sign pop-up appears several times, then goes away and no data is displayed.
I just saw your post on the shareable issue. I get No Subscriber Content message too. I shared my feature layer, then made it hosted and share that, but still get the same message. Did you figure out how to share your dashboard?
I am also now having this issue. Has previously been working and all layers included are public.
Only difference is that I'm working in Portal.
Does anyone have any suggestions/ideas how to share a public dashboard without having to sign in? If I can bypass this, it would solve a lot of issues. Would love to be able to update these dashboards and share them publicly.