Hello there,
Please refer to the following information.
1. In the navigation tree on the left, choose System Tools > TR-069. In the pane on the right, set the parameters related to the interconnection between the ONT and the TR-069 server

NOTE: Configuring the interconnection between the ONT and the TR-069 requires creating a WAN interface. In addition, Service List of the WAN interface must contain the TR069.
2. Click Apply

Thanks!