No. Your user name, password and any 2-factor authentication process in place for your existing account will remain active following migration. You will, however, be assigned a new account ID for your migrated account.
Will my login credentials change after Brexit migration?
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Why can I log in to Client Portal but not TWS?
My login credentials are correct but I am still unable to add my external account to PortfolioAnaylst.
Have my login credentials changed?
How can I access activity statements before account transfer to IBKR Singapore?