IBKR keeps telling me it's interest when I challenge them!
"Thank you for contacting IBKR Client Services.
Kindly note that we believe that the interest payment is correct per our 3rd party tax source, if you have a copy of the 8937 from the corporate action showing that this should be taxed as long term capital gains, please have a copy attached so our back office can review this item."
How did you get this remedied to be long-term capital gains?