Last year I received a six months research scholarship from DAAD within a collaboration with a Germany university. The total grant was around 21550 Euros. At the same time I was receiving my monthly wage from the USA. 

A scholarship in [Germany is tax free][1] as well as in the [USA][2], however, I am bit concerned because at the same time I had my salary. 
In this case is the scholarship tax free? Do I have to submit a tax declaration in Germany and pay the tax of [1907 Euros][3] there, as my salary is taxed in the USA, and apply for "Foreign Earned Income Exclusion" in the USA? Or I just file my tax clearance in the USA? 

  [1]: https://www.euraxess.de/germany/informationen-beratung/steuern/tax-exemption-fellowships
  [2]: https://taxdepartment.gwu.edu/taxation-scholarships-fellowships-stipends-0#:~:text=A%20scholarship%2Ffellowship%20payment%20received,supplies%2C%20and%20equipment%20required%20of
  [3]: https://visualsm.art/gross‑net‑salary‑calculator/