Multisite Compatible?

I’ve had a system set up which was working great, and I’ve now ported over the themes and plugin to a multisite setup, however I get the below error when viewing the (example) URL http://subsite.multisite.com/wp-json/acf/v2/post/

{“code”:”rest_no_route”,”message”:”No route was found matching the URL and request method”,”data”:{“status”:404}}

Any ideas?