Lightning Dashboard error message: You need permission to view this dashboard. Ask your Salesforce administrator for help

I have recently migrated our field reps from a homegrown mobile app to the Salesforce Mobile App. Now as I second step I'm updating reports and dashboards and am still finding myself stuck between the Classic and Lightning worlds.

While in Lightning I have a cloned a "Classic" dashboard that the user has access too. The dashboard is in the same folder as the original with same shared access, but gets the error message. If I try to edit this dashboard while in Lightning, I get the warwarning in the attached file which tells me it's  in "Classic". If I clone the same dashboard while in Classic, the user can see this report in both Classic and Lightning.

I've tinkered with system permission of our profiles/permission sets, but nothing worked. Any ideas?