Will iOS region monitoring call didEnterRegion on my app if my app is in a terminated state?

Yes, see Region Monitoring

In iOS, regions associated with your app are tracked at all times,
including when your app is not running. If a region boundary is
crossed while an app is not running, that app is relaunched into the
background to handle the event. Similarly, if the app is suspended
when the event occurs, it is woken up and given a short amount of time
(around 10 seconds) to handle the event.

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