I'm new to Power Automate. I have a team who wants to use Lists and Power Automate to track and manage their requests. I created a flow that posts a message to Teams when a new item is created. That worked well, but I was just using one user. I need it to be sent to three members of the team. My IT Director added their names to a shared mailbox that isn't being used. Through Outlook, I'm able to send an email and they all received it. I was just trying to edit the flow and tried to change the recipient name from a specific user to the shared mailbox and I received this message: No user details with email or UPN 'canon10-1@gfrlaw.com' were found in Graph. I don't know that means or how to fix it.
Which Teams action are you using to post the message? Could you please share a screenshot?
You can't use a shared mailbox address as a normal user, that's why you are receiving the error. You just need to create a Team with the required members and then with this action you should be able to configure the message:
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