Or, it can be simply due to nationality of OP instead of his trading. U.S. sanction.... Iran, Saudi Arabia, North Korea, .... Check this out too.
I mentioned it in another post here, and I will mention it again. Your open trade equity/NLV for the exchange exceeded the segregated account value of the whole firm. You are too big for them.
A possible tax avoidance/evasion situation also exists based on account types involved. Lets not forget, IRS involvement with futures contract trading goes way back. it was in the days of Dan Rostenkowsky that 60/40 tax treatment came about because traders were straddling year-end positions, pushing taxation into the next year. Does IRS oversight fall into the lap of a broker/fcm compliance department? IDK I'll take a side siphoned from the IBKR evangelists... it's for the good of all AMP customers, and the firm itself.
I think AMP is operationally-sound. There really isn't anyone else in the space that fills that intraday niche. You can run TT, CQG, etc. The problem is that their customer leverage precludes putting any serious money with AMP. I've opened an account at AMP but have yet to fund it. Seemed sound for gamma-trading my vol-positions in index, but I always carry overnight risk, so it doesn't make sense for me to hedge outside the vol-account. I wouldn't hesitate to trade 10% of my net liq with AMP if I went home flat each day.
You can look at AMP's daily CFTC filings. Since March you will see they have taken a hit with customers accounts in deficit. 3/2 the number was 142,352 on 4/21 902,865. Most likely from all the limit down action in equities and the oil collapse.
Yes, absolutely insane to have that kind of money with AMP. Like another post said they're doing this gentleman a favor. Move on, and do your homework on where to park that kind of money.