User defined field of an email is not available in flow to use like you already can with Subject or Body or To, CC etc I vote this is made available so it can further enhance the flexibility of using 'When new email arrives' actions. I am trying set a condition of a flow based on the value stored in a user defined field of an email. The idea is the email comes into the O365 inbox, the flow is triggered by new email arriving. I then initialize a variable and look to set the variable to what is in the user defined field of the email. A condition can then check the variable and if it is X then do something and if it is not X then do something else.
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