Huzzah!!! Thank you so much for your help.
One question. It definitely appears to be working now, communicating through to nRFCloud.com just fine. In LTE Link Monitor, I’m seeing the following in the log, pinging away once per second…
2022-01-08T21:12:37.149Z DEBUG modem << +CESQ: 99,99,255,255,11,50
2022-01-08T21:12:37.154Z DEBUG modem << OK
2022-01-08T21:12:38.053Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:38.160Z DEBUG modem << +CESQ: 99,99,255,255,12,49
2022-01-08T21:12:38.164Z DEBUG modem << OK
2022-01-08T21:12:39.047Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:39.148Z DEBUG modem << +CESQ: 99,99,255,255,11,49
2022-01-08T21:12:39.153Z DEBUG modem << OK
2022-01-08T21:12:40.050Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:40.060Z DEBUG modem << +CESQ: 99,99,255,255,11,49
2022-01-08T21:12:40.064Z DEBUG modem << OK
2022-01-08T21:12:41.048Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:41.161Z DEBUG modem << +CESQ: 99,99,255,255,13,49
2022-01-08T21:12:41.166Z DEBUG modem << OK
2022-01-08T21:12:42.052Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:42.150Z DEBUG modem << +CESQ: 99,99,255,255,14,49
2022-01-08T21:12:42.155Z DEBUG modem << OK
2022-01-08T21:12:43.047Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:43.150Z DEBUG modem << +CESQ: 99,99,255,255,13,49
2022-01-08T21:12:43.155Z DEBUG modem << OK
2022-01-08T21:12:44.052Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:44.160Z DEBUG modem << +CESQ: 99,99,255,255,10,49
2022-01-08T21:12:44.165Z DEBUG modem << OK
2022-01-08T21:12:45.047Z DEBUG modem >> AT+CESQ
2022-01-08T21:12:45.155Z DEBUG modem << +CESQ: 99,99,255,255,10,49
2022-01-08T21:12:45.159Z DEBUG modem << OK```