We are using Splunk Enterprise 6.4.3 with Punchcard Custom Visualization 1.0.0.
User role with Read Only access are getting "No matching visualization found for type: punchcard, in app punchcard_app". This works fine for Admin and Power Users.
When you go into Manage Apps, does the Read Only role have permissions for the app?
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Thanks @cmerriman. Although this is yet to be migrated/tested in Prod. Missing Read Only Permission for Read Only group of users seemed to be the issue.