Following the Salesforce release of a restriction to custom metadata types, Salesforce non-admins no longer have the required permissions to get the needed information to pull in Spinify leaderboards.
You may see this message on the "Leaderboard" page or lightning component:

To resolve this, you will need to re-enable read access to custom metadata outside of Apex code or system mode contexts. To accomplish this in Salesforce:
- In Setup, navigate to Schema Settings.
- Deselect Restrict access to custom metadata.

If you have any questions please contact the Spinify Support team.