u-blox Nina b112 error + Sara G350

Sir,
How are you ?
After config

"nsapi.default-cellular-apn": "\"java.com.br.br\"",
"nsapi.default-cellular-username": "\"claro\"",
"nsapi.default-cellular-password": "\"claro\"",
"GENERIC_AT3GPP.tx": "p8",
"GENERIC_AT3GPP.rx": "p11",
"GENERIC_AT3GPP.baudrate":115200
},
"NRF52_DK": {
"target.macros_add": ["UBX_MDM_SARA_G3XX", "UBX_MDM_SARA_G350"]
}

I am getting the error

mbed-os-example-cellular
Failed to get_default_instance()

Can you help me ?

Start by reproducing mbed-os-example-cellular with the posted NRF52_DK, SARA G350, and cellular configuration, then trace where the "Failed to get_default_instance()" message is produced. Done means the cause is identified and documented with a confirmed configuration or hardware-specific resolution.

Written by the indexing model from the issue text.