I created a PowerApp where there is a reviewer field and this is a person / group field type. When a user completes a form and enters a name in the reviewer field and submits, the reviewer gets an email notifying them that an item has been assigned to them. I want to find out if when that reviewer is not responsible for the item, and the name changes in that field, a workflow should send an email to the new reviewer notifying them that an item has been reassigned to them, as well as notifying the previous reviewer that the item was reassigned. What is the most efficient way to achieve this. Thanks in advance for any guidance.