Translations:Faq/22/en
From ArdorDocs
Exchange IGNIS to ARDR transaction returns "not enough funds"
Coin exchange transactions from any child chain to the Ardor parent chain are recorded on the parent chain since it affect the ARDR balances and therefore pay fee in ARDR. Therefore exchanging IGNIS to ARDR using the coin exchange is impossible unless you already have ARDR to pay for the transaction fee.