Whoops forgot to tell you why most people prefer option 1. (Attachments are very limited in size)
If you followed the following steps exactly it should have registered. If not then you'll have to wait till Support gets back to you.
- Open your Provision House and select the second tab and click Traveller Family
- Set the slider to 2 adn click the button with the green check on it
- Wait till the production is done, open your quest book and check if the quest requirements are green
As a last resort and if you really want to try and finish it, you might want to try and produce and apply 10 Traveller Families (so 50 settlers)
We have had issues with "Traveller Family" quests in the past, so who knows...