I sold some of my crypto via Kraken's OTC desk. Kraken does not report such trades on my 1099-DA, but Koinly still marks them with box K.
These payments should have box L checked
Solution
Kraken issued a separate 1099-DA for OTC Sales, meaning that these sales should have the box I/H set.
If you want to upload the OTC 1099-DA to Koinly:
  1. Create a second wallet "Kraken OTC"
  2. Edit the trade and later withdrawal and change the wallet to "Kraken OTC"
  3. Add a transfer from your Kraken wallet ton "Kraken OTC" 1min before the trade
  4. On the "Tax Reports" page, upload your 1099-DA for Kraken OTC