Can't use WAN port on Pepwave MAX BR1?

I tried reading the manual but it’s showing features that don’t show on my router. My device name shows as “MAX_BR1_AAC1”. I have an ethernet port specifically labeled as “WAN”, but it seems I can’t use it to connect to WAN? Under Network > WAN I only have Wi-Fi WAN and Cellular, no ethernet WAN even though I have a port. What am I missing here?

What model do you have?
Is it a br1 mini?
If so you need to purchase a license for the wan and wifi-as-wan.
You can enable the load balancing license to test this.