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This is not mentioned in the main Flow Help Docs that you can trigger a Flow on publishing of FlowExecutionErrorEvent. It is mentioned here though https://help.salesforce.com/articleView?id=flow_considerations_design_pause.htm&type=5
It’s easier to trigger the Flow than within Process Builder
There isn’t a lot of information in the FlowExecutionErrorEvent to use in the Notification or email.
See above re Notifications issues though.
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