nRF Cloud - Signal Strength Indicator

Hi,

I have an nrf9160 on a custom board connected successfully to nRF cloud and i'm pushing data into it. I send the modem info to the device shadow, and also send RSRP messages like below once every few minutes. 

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{
"messageType": "DATA",
"data": "-96",
"appId": "RSRP",
"ts": 1678416372978
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

But, I can't see the device's signal strength in the nRF Cloud device managemenet page, it just shows up as N/A. 

The device is making cellular positioning requests with both MCELL and SCELL and will also use GNSS at times, along with A-GPS and P-GPS. For other data, I'm following these schemas: https://github.com/nRFCloud/application-protocols/tree/v1/schemas/deviceToCloud 

What other data do I need to be sending for signal strength to be showing up?