I have my broadband router with wifi disabled and connected a Huwaei AX3. I've configured the wifi on the AX3 in AP MODE and works as expected using my custom SSID i,e denrok_home and passphrase. After syncing a second AX3 to the main one using the H button the ssid of the second device doesn't change i.e it stays as huawei_xxxx and reports as OPEN/INSECURE i.e if i connect to that SSID with no password I can browse the internet via my broadband connection.
On the second device if I connect my laptop via ethernet to it I can ping out to the internet and i'm given an ip via dhcp from my asus router so that's right the same as when connecting via wifi.
Huawei were completely useless at helping with this.
Someone mentioned on a different forum that mesh is disabled in AP mode but not sure if this is correct?