Why am I receiving error message 'Close Only' when attempting to enter opening positions?

Q: Why am I receiving error message 'Close Only' when attempting to enter opening positions?

SEND TICKET TO CLIENT SERVICES Your account may have been placed into "Closing Only" mode. Please contact the IBKR Trade Desk for additional details: Select Trade Issues as the ticket category followed by Order Status and type " Closing Only " as the subject Provide the following information in the ticket body: Account Order date and time Product type (e.g. Stock, ETF, Future, Option, etc.) Product ticker symbol (e.g. AAPL) Exact order rejection message

Question

Accepted Answer

SEND TICKET TO CLIENT SERVICES

Your account may have been placed into "Closing Only" mode. Please contact the IBKR Trade Desk for additional details:

Select Trade Issues as the ticket category followed by Order Status and type "Closing Only" as the subject
Provide the following information in the ticket body:
1. Account
2. Order date and time
3. Product type (e.g. Stock, ETF, Future, Option, etc.)
4. Product ticker symbol (e.g. AAPL)
5. Exact order rejection message