Ulan code cannot be scanned. What's going on here?

Ulan code cannot be scanned. System crash or poor contact. Ulan code scanning can't detect system crash or poor contact. The crash needs to be restarted, and the poor contact needs to be unplugged and unplugged. The Significance of Ulan Code Replacing the Original Local Code Ulan Code is a proprietary two-dimensional code generated by Wulanchabu local code system for key places. By scanning Ulan code through WeChat, you can complete the double verification of health code and travel code.