Kraken does not send to Revolut, you won't be able to add Revolut IBAN
I'm pretty sure it was listed on the 'not working' part already.
OP, I think it will be more compelling if you can add some screenshot (with all personal details blocked out of course) or any other details when you do the test transaction. Just a suggestion, there's no need to do this if you don't like the idea.