Your joint account was not invited to enroll in the Insured Deposit Sweep Program because your joint account may have insufficient funds, a non-valid tax ID, the joint ownership is not 50/50 or at least one co-owner is already enrolled in the Insured Bank Deposit Sweep Program from a separate joint account.
Why was my joint account not invited to enroll in the Insured Bank Deposit Sweep Program?
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Are non-U.S. residents allowed to participate in the Insured Bank Deposit Sweep Program?
Who is eligible to enroll in the Insured Bank Deposit Sweep Program?
Can I use the Insured Bank Deposit Sweep Program in an IBKR Lite account?
How do I make sure my accounts do not exceed FDIC coverage limits when using the Insured Bank Deposit Sweep Program?