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Clockwise-
That's an MW079, I dunno if you should be messing with an MW079.
That's part of an FSA self-extracting crank assembly, not a DT Swiss hub part, so you are correct.
Shop said that it was in the hub when I gave it to them (mysteriously, as it'd never been built), between the MTB freehub and the 12mm bolt-thru endcap, so they carefully removed it from there and put it in between the new 11 speed road freehub and 10mm bolt-thru endcap.
Dammit
Assembled (loosely):
Remove end-cap, what's that skip?
It's a washer:
Which was binding the end-cap to the bearing and the inner face of the freehub:
As we can see when we look at the other face of the washer:
And now that the washer is removed everything works.