If I link two accounts enrolled in SLS, are there any restrictions with respect to the security device which will remain following linkage?

Account holders maintaining a long security position (e.g. stock or bond) that is worthless but has not yet been cancelled by the depository may submit a request to have that security removed from their account via a process referred to as Dollar for Lot.  Here, IBKR will take over the worthless position for a nominal payment of USD 1.00 as consideration…

A cash account maintaining only long cash and securities remains susceptible to liquidation if the cash balance falls into deficit. Were a cash deficit to occur, this account type does not afford IBKR the opportunity to issue a loan using the securities as collateral. The circumstances by which a cash type account might incur a cash deficit include the following:…

For security reasons, it is not possible to disable the SMS authentication. The mobile two-factor authentication via SMS will be removed once you activate one of the digital or physical security devices…

The following linkages of a primary user to the identical primary user on another IBKR account are supported:

• Linkage between two or more identically owned individual accounts.
• Linkage between an individual account and an identically owned IRA account…