First, try resetting the IP camera. Press the Reset button for approx. 10 seconds and then start initial operation again.
If initial operation via WiFi (WiFi/QR code) is still not possible, you can carry out initial operation via LAN (wired) and then connect to WiFi. Reset the IP camera again and follow the instructions for "wired” initial operation. You can set up the WiFi connection via the app settings (gearwheel icon) under Network.