"Greet all your friends when you enter the house."
Translation:E aloha i nā hoa a pau ke komo i ka hale.
Mahalo e Graeme. I believe it can take up to 11 days to update at this time, maybe a little more. That's just how the Duolingo system is set up right now, unfortunately. They've said they are working on decreasing that time though, and hopefully it will be faster in the future.
I think if you look closely at the sentences in this section that have the word "komo", you will see that it is always "ke komo" and not "i ke komo".
The "ke" is special here. It's not the usual "ke" or "ka" that just marks a noun-type word. The "ke" here means "when/whenever". So, "ke komo" as it's used here means "when/whenever (you) enter".