The reciprocal agreement does not apply to part year residents. It will apply in 2020 when you will be a full MI resident. You should not be using line 12, Schedule A. You will have to allocate your income between both states. What your're missing is that the OH instructions fail to clarify "you must be a FULL YEAR resident of Indiana, Kentucky, Michigan, Pennsylvania, or West Virginia.
I assume you continued to working Ohio, after moving to MI. It gets complicated. All your wages are taxable by Ohio and must be allocated to OH, since they were earned there. . The wages after moving are also allocated to MI. MI will then give you a credit, or partial credit, for the OH tax paid on wages paid after the end of June.
