Hello, friend!
The ONT cannot be accessed through the Ax3 pro, the IP addresses in the problem description are the management IP addresses of the LAN ports on the two devices.
The Ax3 pro is a consumer router and can be connected to a PC or Huawei AI Life app through a cable for management and maintenance.
The ONT supports only wired or wireless login. According to the problem description, the ONT is not located at the local end. However, you can log in to the ONT through the NMS or OLT through Telnet to manage and configure the ONT.
Thanks!