Hi @danjameswalker,
Unfortunately, Metro don’t offer a proper API, only a “modified customer interface” (MCI) which isn’t the same thing. This allows them to say that they are Open Banking “compliant” even though they don’t have an API.
For more information on this, see this post.
I’m sure Emma will quickly integrate Metro support again if they do launch a real API. It’s the same story for Co-operative Bank.