Thanks, Sara; I’ll check out the FPLMN issue and keep trying with a modem at my desk.
What’s the easiest way to send AT commands directly to the modem? Load StreamDebugger on a Mayfly, as described here? https://www.envirodiy.org/topic/trouble-initializing-xbee3-lte-m/#post-12658
I can’t seem to get any response; i.e., nothing gets echoed to the serial monitor window in PlatformIO.