How do you unlock Isabelle in Animal Crossing: New Horizons? Isabelle will come in and help Tom Nook after you have upgraded Resident Services from its tent status. Here are the tasks that you’ll have to do in order to trigger this:
1. Pay off your first loan with 5000 Nook Miles, then upgrade your Tent to a real house.
2. Help Timmy and Tommy set up a Shop and create Nook’s Cranny.
3. Complete Tom Nook’s request of setting up land for 3 New Villagers.
Once you have completed all of the tasks, you should get an announcement from Tom Nook the next day about his plan for upgrading. Once Construction has begun, you’ll get access to the upgraded Resident Services the following day.
Once you have upgraded Resident Services, you’ll unlock Isabelle to be part of your Island. She’ll be handling morning announcements now and you can discuss island affairs with her. You can change your island’s flag, and tune with her. Also, you can even ask her to reprimand other villagers if you want.
For more information, you can also check our Resident Services page
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