We are trying to create a dynamic Security Group in an Hybrid environment, where all our the users in that group are able to send on behalf of a specific 'Shared mailbox'. We are doing this to allow the shared mailbox to be the default sending address for emails sent via power automate, which are triggered through a PowerApps. Currently, when the power automate is triggered via a PowerApp the flow fails as user triggering the app does not have the 'Send As' permission. We are looking for a method where all mail responses come from a single centralised shared mailbox SMTP address. We would like this dynamic to ensure the group only contains current users. Any ideas?


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