Modem Startup Fails on Custom Board and Works on DK

Toolchain v2.70, SDK v2.6.1, VS Code, Windows

Code derived from UDP sample works on DK board but fails on custom device.

Device is using DK board configuration, but no other peripherals are employed at this point.

On calling nrf_modem_lib_init the following output is displayed on the console:

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***
UDP sample has started
[Call happens here]

E: nrf_modem_at_printf failed, reported error: 65536
E: Failed to configure PSM, err -14

Subsequent modem calls produce similar errors.

Questions:

1. Any way to get more detailed diagnostic information?

2. Anything in the hardware design that could cause this?

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