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Could this be Phaonia angulicornis, Phaonia atriceps, or some other Muscidae?
It is a fairly common little, 5-7mm, very black fly which I recognise by it's bullet shaped, blunt-pointed, abdomen. I notice it has 2 spines on it's wing at the end of Sc, which might be useful for ID.
It was very busily nectaring on fresh blossoms in a large patch of invasive Solidago on a dirt road between fields left to fallow - a sunny day.

24th Aug. 2021.
Flensburg, N.Germany:- 54.754620, 9.424617

Many Thanks in advance,
Ray