Yes, you will need to pay the taxes in Germany and then ask for a credit using both Form 1116 (the foreign tax credit form) and Form 8833 (Treaty-Based Return Position Disclosure).
Since the income is "re-sourced by Treaty", and not income earned in Germany, the Treaty position lets the IRS know the reason you are claiming a foreign tax credit on US-source income.
Form 8833 isn't included in TurboTax, but since it doesn't calculate your tax and only communicates your treaty position to the IRS, you could fill it out manually and attach it a paper-filed return. However, at least for your first year filing in this manner we do encourage you to seek advice of a tax professional with experience filing with both of these forms.
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