"Sent" counts the contacts moved to the SENT status. The status is stored in a contact property (key qq:status:<campaign>) and equals SENT or FLASHED. As long as you have not moved the contacts to the "sent" status, this counter stays at 0.

"Scans" counts the real qr_scan events recorded when a QR is flashed. A "flashed" contact (FLASHED) is a contact that was sent AND then scanned: it therefore counts both in Sent and in Scans.

If everything is at 0, check:

The selected period: the dashboard filters by date, an interval that is too short can hide everything.

The campaign concerned: an indicator is relative to a specific campaign or workspace.

Inactive workspace: an archived or being-deleted workspace stops recording events (scans redirect but no longer count).