Windows IoT dashboard only has an option "Raspberry Pi 2". What if I have RPi 3? Can I use RPi 2 image on Raspberry Pi 3?
I tried installing the existing RPi2 version on my RPi 3B+ and it didn't boot up! I was hoping it would boot up without the Bluetooth and WiFi working, but nothing happened. There are beta versions available for RPi 3B+ if you are a member of the IoT core insider programme which apparently was full last time I checked.
You need a new build for the Pi 3. It is still a preview build and doesn't support the Wi-Fi or BT but it does work. You can find more at this link which includes a link to the preview build: Windows 10 IoT Core support for Raspberry Pi 3.