How to Deal with the Man-in-the-Middle?

Got hired into a senior leadership role at a fairly large corporation. The role is within the central IT/digital function, however the individual business units have their own technology sub-units that work as a man-in-the-middle. Think of e.g. logistics having their own logistics IT that is there to facilitate dialogue between the logistics operators and the central IT who is in charge of the actual delivery of IT development, deployment, and operations.

During my interviews it was coming through that there is a challenging relationship between the centralised IT and the business area IT units. That sounds understandable since facilitating a great collaboration between the end user and central IT could make them (business function IT) superfluous.

Has anyone been in a similar and has some words of wisdom they would be willing to share?