Unifi Gateway cannot reach Internet - Peplink 20x on T-Mobile

We have the 20x connected to the carrier and it has internet access. We have a Unifi Firewall Gateway plugged into it that needs to negotiate to the FW/GW Controller on the internet. While we can plug a PC into the 20x and it accesses the net, the fw/gw says it cannot reach the internet even though it is obtaining an IP from the 20x (cellular IP address). This is the first 20x that we’re trying to use to standup a new location and looking to you these as redundant connections to our fiber internet connection. Thanks

What IP range is the 20X using for its LAN, does it overlap with the IP range the UniFi USG is using for its LAN?

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