This Wiki page provides you with some tips on working with LEX Dashboards.
If you take a look at a Dashboard and do not see any data where you expect some please ensure that the running user of the Dashboard is set to a Force.com platform user:
Please also note that the Running User should have an ADvendio License assigned. Please take a look here to check the licenses of your users (for Admins): 7.1.2 Manage Users and Licenses.
Otherwise you might encounter the following error message:
Error: The source report is based on a report type that is inaccessible to the dashboard's running user. |
For further information on the creation and customization of Lightning Dashboards please take a look at the following Salesforce Help pages: Build a Lightning Experience Dashboard & Edit and Customize Lightning Experience Dashboard Components.