This topic is incorrectly marked solved because using ATC to choose a runway and announce taxi and departure is not enough to have the takeoff logged.
I always have my uncontrolled airfield takeoffs logged, but only because I turn on the taxi ribbon temporarily to see which runway for takeoff the sim is requiring to log the takeoff. I follow the taxi ribbon path through the point that it is extinguished at the hold to announce the departure point.
I can turn the ribbon off as soon as I see where the ribbon is heading. When that sim required runway would give me a tailwind, after taxing to that incorrect runway hold position I continue to taxi to the proper runway for a headwind, which in that case is usually the opposite end of that runway.
Yes, I know it is immersion killing and stupid to have to do that extra taxi when the sim expected runway does not match the correct runway for a headwind, but that is the only way to 100% guarantee that 100% of takeoffs at uncontrolled airports get logged.