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Has this happened often to your friend?
Just the one time. I've tried to reproduce it, but with no luck. Sadly he isn't the type to log in to forums and discuss stuff like this, or he'd be here with more details.

The key points though, were that the quest popup never showed. It wasn't post poned ever. Also, reloading the game had no effect.

There are two ways to trigger this quest, right?

1) Enter a tile, and that tile is within 2 of an unactivated portal.
2) Start the turn, and a unit is within 2 of an unactivated portal.

Both only effecting player controlled units. Is it possible that somehow the portal didn't think it was deactivated, or that the units were not owned by the human player?