If the camera reports an "Authentication error" error when you connect it:
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The error can be caused by the router's encryption method not being supported.Please set the router's encryption method as WPA/WPA2-PSK.
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The error can also be caused by special authentication methods like SMS/Web authentication being enabled.
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Please disable any special authentication method like SMS/Web authentication.
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If possible, try to connect the camera to another Wi-Fi.
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In addition, you can also try rebooting the camera to add it back to the WiFi network.