Have you spent any time at all with this new team in person? If not, I suspect it would be valuable to meet with the team face to face. Sure, you can do calls and such, but it's a lot easier for them to think of you as an outsider if you haven't actually occupied the office space.

You might also consider getting a mentor within the company. This is how we do it at $employer; you report to a manager, but your tasks and assistance come from a single mentor whose purpose during your tenure is to guide you towards completing your assigned project.

Have you been given a large but attainable project, or are they expecting you to just fix bugs and the like?