The guard is not able to Scan the Checkpoint, because either the Mobile App hasn’t been synced recently or this Checkpoint belongs to a different Branch Office than the one the Guard is assigned to.
Note: Generally, a Guard and a Checkpoint must be assigned to the same Branch Office in the Web Application in order for the Guard to perform successful Scans.
Please try to Force Sync the Mobile App (using the Troubleshooting guide, item 7) and report this to your on-premises Administrator of QR-Patrol for further review.