U.S. residents are unable to trade options on futures for most foreign indicies, such as the DAX.
IBKR imposes certain limits on the number of active orders an account is able to have outstanding at any one time.
If the total number of active orders in any one account exceeds 10,000, any new orders submitted in excess of 10,000 will be rejected.
In addition to the limit on total orders in an account, there is also a limitation on stacked orders for any one contract, on the same side of the market (either buy or sell). If the total number of stacked orders exceeds 15, new orders are rejected. For example, if you had placed 15 separate buy orders for IBM, your attempt to place a 16th buy order for IBM would be rejected.
When attempting to create sub accounts for themselves, many advisors cannot complete the process due to the client email address matching that of the advisor.
Information:
As a measure of client protection, IBKR will not allow the e-mail address of a client to match that of the Advisor.
A popular option is to create a new e-mail address for yourself, using a free service such as Gmail.
This will allow you to create the new sub account.
Portfolio Margining accounts reporting net liquidating equity below USD 100,000 are limited to entering trades which serve solely to reduce the margin requirement until such time as either: 1) the equity increases to above 100,000 or 2) the account holder requests a downgrade to Reg T style margining through Client Portal (select the Settings, Account Settings, Configure and Account Type menu options).
If a Portfolio Margining eligible account reporting net liquidating equity below USD 100,000 enters an order which, if executed, would serve to increase the margin requirement, the following TWS message will be displayed: "Your order is not accepted, margin requirement increase not allowed. Equity with loan value is less than 100,000.00 USD."
IMPORTANT NOTICE
Please note that requests to downgrade to Reg. T will become effective the following business day if submitted prior to 4:00 ET. Also note that as the Reg. T margining methodology generally affords less leverage than does Portfolio Margining, requesting a downgrade may lead to the automatic liquidation of positions in your account in order to comply with Reg. T. You will receive a warning message if that is the case at the time you request the downgrade.
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