You can try the following methods:
1. Check if the QR code is correct: Make sure you scan the correct QR code and that there are no recognition errors or other issues.
2. Check if the network is connected: If your network is not good or disconnected, the QR code may not be activated. Make sure your network connection is normal.
3. Scan the QR code again: If the above two methods do not resolve the issue, try scanning the QR code again. This may be due to network delay and other reasons.