It appears that i've had a margin requirement change from 10% to 25% on open positions (of CO2 - Carbon Emissions commodity), with no notification let alone notice and I can't find any details of the margin in the transaction history. The only reason I believe this to be true is I never had enough equity to buy at the prices my positions were opened at. As the trade went against me I couldn't figure out why I was so underwater, can anyone from IG confirm these changes and explain why if true, there was no notice of the changes.