Flow to send email to Contact Owner on Bounced Email

 Hi folks,

I have a Flow to send an email to either an Active Contact Owner or shared email address if Inactive Contact Owner when an email bounces.

I am using the EmailBouncedReason field to trigger the Flow

EmailBouncedReason IsNull = False

As best as I can test this using debug, it seems to work but it's not working in real life, no errors but no email bounced alerts

Any thoughts?

I'm sure I'm missing something obvious :-( 

Anyone created a Flow to do this?