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Since Fixedfloat is a regulated service, here you need scammer's exchange information which is classified as privacy. I doubt you will get that information without providing a warrant of authority. As per their policy:
The Personal Data is processed on the basis of (a) your consent or (b) provisions of law (including any relevant laws and regulations on counteracting money-laundering and terrorism financing) that authorize to process Personal Data.
Fixedfloat only provides the data the authorities need to investigate your case, they will not necessarily conduct an investigation that is not the service's responsibility. But I will look forward to your updates.
Found a small bug on service
It's a good idea to tell support.
https://fixedfloat.com/support