The Staff Immigration Team (SIT) provides free and impartial advice on immigration matters to current and prospective University of Oxford employees, visitors, and their accompanying dependants. As the SIT is not a legal (lawyers) office they cannot provide advice to anyone who is not a visitor to, or current or prospective employee of, the University of Oxford.
The HR team in the department/ faculty/ college offering offering the role, or hosting the visit, would be the first point of contact for visa applicants and visa holders. SIT are happy to help with queries but they should normally be raised/ discussed with the relevant HR team first who would then contact SIT for advice.