Worst thing is they force me now litterly force me to get my customer to reach to them i am calling him in middle of night on telegram and he is pissing me off for that and i bet he will say its your problem i think i will be first guy who killed himsef over being blocked his own money my luck is really fucked up i got job after 2 year being unemployed worked always below developler average payment and finnaly when i got experience and start to get reputation i get fucked on my first big payment job i will let you guys know what is status daily i contacted everyone i could and they are all as shocked as you are. i provided everyone proof and same thing i providoed to them it's just pointless they are like robots constantly saying one thing this is worst than CCP blocking money of people what the fuck is happening with world at this moment that always bat is broken on back of honest
Asking you to ask your customer to provide supporting evidence of the legality of funds [or whatever they asked him to provide] is rather counterproductive and make little to no sense.
Let's assume for a second that you are indeed doing criminal activity, stealing fund or whatever, and that customer is your partner, or even yourself pretending to be that second party. By asking you to ask that "customer" to provide proof, there is nothing that can stop you from fabricating them and supplying it to FF, given you both are on it together.
If they really want to prove the source of that fund, or whatever it is they tried to prove, the most logical way for them to conduct a thorough investigation will be to contact that user themselves. They have the contact details [which they acquire in a rather unethical way], they have a team that knows what to look for [and thus, what to ask], they can do it themselves.
That's the problem, they won't reach out to them themselves. This happens a lot with EMI's too, only difference would be that most ask for supporting evidence from the receiver and not the sender. At the end of the day, fixedfloat is most likely pulling a scam here, afaik whoever is behind it is a private figure, so we don't really know who's running the whole thing. Selective scams also happen a lot with platforms like this one, freewallet does it too.