A lot of Kodos seem to be unable to be tamed with the kodo kombomulator as well as not getting credit when bringing the kodos to Smeed Scrabblescrew.
The only message I recieve when trying to use on some of them is this item is not ready yet.
You have to talk to the kodo after it’s stopped, that removes the debuff (which is why you’re getting ‘item is not ready yet’) and gives you the credit for the taming.