Tongliao city can't scan the health code through one yard.

1. First of all, the current user network is poor. Users are advised to check the network status of their mobile phones.

2. Secondly, the current health code is invalid and the result cannot be scanned. If the health code is invalid, the user can refresh it again.

3. Finally, the current system is out of order, so users are advised to wait for some time before re-operating. Due to the epidemic, people need to scan the health code to locate everyone's location.