systemd // failed with result 'dependency'

I'm quite new to this systemd topic. I have some Units with varios Requires, After and Before. On some Units I got messages like:

But which dependency in detail? This is how I tried to drill down to the problem:

Take a look which service is required...

Move on to flannel-wait.service:

Drill depper..

As far as I understand this, the flannel-wait.service relies on the flanneld.service -which is running. But after all, why does it fail?

Thanks in advance!