@makabde, I don’t know if you are still having this problem or not. I was running into the same problem, was not able to find a solution online, but stumbled my way through to something that worked.
I’m assuming your @create_attrs look something like:
@create_attrs %{emails: [%{address: "some@address.com"}]}
I needed to change mine to look like:
@create_attrs %{emails: %{0 => %{address: "some@address.com"}}}
