nRF9131 modem Init failure

Hi, having a little of an issue and would appreciate your support:

When bringing up a board which has the nRF9131 and the nPM6000 I'm getting the following error when doing nrf_modem_lib_init();      

 Modem fault! PC: 0x001299C2, Reason: 0x010 - ASSERT

[00:00:07.263,732] <err> nrf_modem: Modem library initialization failed, err -5
[00:00:07.263,763] <dbg> nrf_modem: nrf_modem_lib_init: Modem init callback: 0xdc7d
[00:00:07.263,763] <err> nrf_modem: Modem library did not initialize: -5
nrf_modem_lib_init failed, err: -5

I tried:

Changing the modem firmware to different versions,

testing on different boards,

re-assembly and probing for any shorts,

adding capacitors near the nPM6000 Vin,

Changing the TCXO to a different model.

still got the same error

Any tips on how to solve this would be much appreciated

Thanks!!

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