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TDOA calls to loracloud

When calling the API v3 I note that by setting locAlgType and doRssiTdoaCombine appropriately, you can specify how you want your data to be used and what sort of result you would like.

I have some data that I am supplying to the API v3 in a call.

If I set locAlgType to RSSI_ALG, expecting an RSSI result, I get an RSSI result. As expected.

If I set locAlgType to TDOA_ALG and doRssiTdoaCombine to True, expecting a TDOA result, falling back to RSSI, I get an RSSI result.

If I set locAlgType to TDOA_ALG and doRssiTdoaCombine to False, expecting a TDOA result, I get "{"result": null, "warnings": []}".

So, my questions are:
1. why can't loracloud calculate a TDOA result for my data?
2. what characteristics does data supplied to loracloud need to have for a TDOA result to be calculable?

Thank you for any help you can offer.