AC87U > AC68U Repeater > T-Mobile Cellspot = not working

[d0g]

My setup is
Modem > AC87U (Merlin 384.13_1) > AC68U (Merlin 384.13) Repeater > T-Mobile Cellspot

The Cellspot is not connecting. The manual says to open some UDP ports.
But the 68, as repeater, does not show options for port forwarding/triggering.
And the 87 does not show the 68's clients.

What am I supposed to do?

I also wanted to try the Parental Controls, but they are on the 87, which does not show the 68 clients.

 

[CaptainSTX]

Is there some reason you are not directly connecting the Cell Spot to your primary router using an Ethernet cable?

I have used a T-Mobil cell spot for four years and it has been plug and play behind a N66, AC1900P and an AC86.. No port forwards necessary. The only thing I do is assign it a static IP as I do with all devices that connect to my LAN regularly.