In order to make the list messages work, we have to give the admin permission on MF Graph (this let the flow executioner read all the people associated within the azure AD, usually the whole company) or the delegated permission (that usually don't have enough permission to read the inbox).
For a more controlled use of this CP, I would suggest na user and password input for the mailbox that you wish to read, to limit the inbox Reading just to the mailbox you have to process.
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