1099- Div Line 12 exempt interest dividends --no details available from Schwab

I have exempt interest dividends on Line 12 of my 1099-DIV downloaded from Schwab.  TurboTax then asked which state or states are the dividends from.  Schwab's composite statement had no further details and when I contacted Schwab they say they do not have any supplemental information like that and referred me back to TurboTax.  I live in Michigan, do I just select Michigan? Can I somehow skip this question? Or should I be pressing Schwab further?