Oddly I had a similar issue. When I went to an ATM it said I had that amount on me, when I tried to put it on a card the card got nothing but my balance went to 0. I think that’s an oops number and really just means you have nothing.
If you want to trade you have to go to an ATM and withdraw money from a card, then it will go into your “balance” which you can use to trade.