[Lemmy]

yes i did trade with the AI, but i only traded ships, a lot of frigate and escort with no weapons on them for a dreadnought, didn't want to research it and the only race that had the tech was an ally, so i couldn't capture it.

But i still didn't trade technology, but when you get an AI tech, by capturing a ship, and the ship uses for instance level 3 misile weapons and you have level 1, you ''l only gain one level, so maybe when you offer the AI tech, the total research points you give is still not enough to trade for? of course i am assuming that the AI looks at research points and not the potential.
I don't know what reasons the AI would have to reject a planet.