An update, as I have now progressed to the IndA map on both of my cities. In my main city I wanted to avoid tirggering the bonus quest, so I could keep doing CA recurring quests with 2 slots for recurring slots. In my secondary city I did not mind too much loosing the 2nd recurring quest, so I used my secondary city as a test-city, by scouting and acquiring provinces and see when Myciena appears (and then know what to avoid in my main city.)
In both cases I followed the northern route (attacking and conquering the provinces of president cartwright), as that seemed to work based on what Jaeils had posted and the screenshot of his IndA map. I guess it should work similarly if one only attacks the provinces in the south (General Dee) instead, but I have not tested this.
Here is a link to the page that has all the maps, so one can see the province names.
https://forum.us.forgeofempires.com/index.php?threads/world-map-revealed.4682/
And I have screenshot of the map in my main city (where I have not triggered the bonus quest line)
View attachment 5941
Things to note:
Conquering Garrincton enables scouting of the bonus provinces - as long as one has also conquered a province that borders said bonus province. Since Garrincton itself borders the leftmost north bonus province (Embruniez), conquering Garrincton enables one to start scouting the north bonus provinces.
-Start: Acquire Okahe
-Scout New Cragshire and Desperation (the main story quests asks to scout both, and it is safe to do so (as long as we don't attack and acquire both. I only attacked New Cragshire as I was following the northern route)
-Acquire New Cragshire
-Scout and acquire Rantford
-Scout and acquire St Marque (Note: although St Marque borders a north bonus province, this is not yet scoutable, as Garrincton is not acquired yet)
-Scout and acquire Garrincton (Now north bonus provinces become scoutable; the south bonus provinces are not yet scoutable, as we have not acquired a province that shares a border). Also a ship appears that allows us to go to PE continent if we want)
Now if events ask us to scout/acquire provinces we have all the north bonus ones to work with, and these will not trigger the Myciena bonus quest)
-Scout and acquire Desperation. The bonus quest line still does not appear, and now we can now also scout/acquire the south bonus provinces.
Now the only non-bonus provinces remaining are: Las Penas and Dragon city
I had made a guess a few months ago that maybe we need to acquire all the provinces to trigger the quest, but that is wrong. Because with next step (tested in my secondary city):
-Acquire Las Penas: Myciena's bonus quest appears! (dragon city still unscouted).
I followed the northern route to get to Garrincton. I am guessing that it should work similarly if someone follows the southern route instead, ie approach Garrincton from the south, and leave Rantford and St marque unscouted. If North/South work similarly, then again the bonus provinces will become scoutable (by taking Garrincton) and Myciena's bonus quest will not appear as long as one leaves Rantford ans St Marque alone. However, I have not tested this south route scenario, so this is just a guess. But attacking the north provinces as outlined above, works. (And one can at the end also acquire Desperation but not Las Penas or Dragon city).