You will need to file an MD nonresident return and allocate zero income to MD. This will refund the withholding. Be sure to update the state withholding with your employer to stop MD and start DC withholding.
In the "My Info" section scroll down to "Other State Income" and indicate you earned income in another state and select MD. This will generate the nonresident forms. In the MD interview you will be asked to allocate each of the income sources. Allocate zero to MD.
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