Dear user, please check your configuration.
In the navigation tree on the left, choose LAN > LAN Port Work Mode. In the pane on the right, determine whether the LAN port works in layer 3 mode

If the check box corresponding to the LAN port is selected, it indicates that the LAN port works in layer 3 mode, that is, the gateway mode; if the check box corresponding to the LAN port is deselected, it indicates that the LAN port works in layer 2 mode, that is, the bridge mode.
By default, the check boxes corresponding to all LAN ports are deselected, that is, all LAN ports work in layer 2 mode. To interconnect, I recommend that you select the check boxes for all LAN ports, that is, all LAN ports work in Layer 3 mode. Finally, click on "Apply".
Thank you!