Harbormaster only works if you use `arc` to submit the patch.
You can see how to use `arc` from the wiki page:
On Fri, Apr 13, 2018 at 4:22 PM, ARJANEN Loïc Jean David
> I'm currently having an issue submitting my first code review. I recently
> registered on Phabricator and tried to send my first code review through the
> web interface. However, Harbormaster is failing to build it with the
> following error in the lease: Couldn't find remote ref. When searching on
> Google for this error, I found indications that it's related to Drydock not
> managing to push the changes to the staging area, likely due to a bad SSH
> key or git URL for arcanist. Could the SSH key issue also apply when using
> the web interface?
> Hoping to read from you soon, I wish you a very good day.
> Yours sincerely,
> ARJANEN Loïc
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