Jersey Telecom is a telecom carrier based in the Channel Islands. They offer a portable SIM that operates in 120+ countries utilizing underlying carriers with whom they have wholesale agreements. In the US they use AT&T, Verizon and T-Mobile as carriers. Their common APN auto populates properly but the BR1 (both Classic LTE and Mini LTEA) fail to connect using the same JT SIM. A Sierra RV50 using the same SIM connects immediately.
Please raise a support ticket (https://ticket.peplink.com/ticket/new/public) for this issue.
Figured this out. Need to set Roaming On to Any Country and lock the bands to those used by the underlying carriers in the location.