Hello friend!
You can try the following steps:
1. Login username/password: admin/HuaweiAdm.
2. In Basic Configuration -> Link Layer Interface -> PTM tab, create a connection between the PTM connection corresponding to the Internet access VLAN (2377) and the IPTV VLAN (588). The VLAN value corresponds to the user-VLAN in the service port. Is untagged can not tick the VLAN 'enable'.
3. On the WAN -> WAN connection tab, use the previous step to create a PTM connection and create a new WAN connection for Internet access and multicast. The connection type is Bridged. The LAN and SSID of the binding list cannot be reused. For example, I configured one port as IPTV and two ports as Internet.