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I am preparing an I.T. request to create a new Shared Mailbox so that we can send automated emails via Power Automate, specifically using the Send an email from a shared mailbox (V2) connector.

I want to make sure that I provide all necessary details in the request about the 'type' of shared mailbox that needs to be setup, as well as any necessary configuration details.

The reason I want to provide these details is that our current Shared Mailbox doesn't provide this functionality, I am not entirely sure why - details are pasted at the bottom of this post for context.

I.T. have already said they cannot enable this functionality on the current Shared Mailbox because it is out of their scope of support, however I have suggested that a new shared mailbox may have this functionality enabled by default, so they are happy to create a new shared mailbox if that is the case.

Research

There is some information here:

Known Issues and Limitations

which says:

To use this integration, you will need access to an O365 mailbox that has the REST API enabled.

Are these the only requirements - ie that it is an O365 mailbox with REST API enabled?

Is REST API enabled on new O365 mailboxes by default?

If not, is it a trivial process to enable this and where are the instructions?

Question

What mailbox features are required to 'send from Shared Mailbox' in Power Automate?

Context

Our current Shared Mailbox 'Send an email from a shared mailbox (V2)' errors

REST API is not yet supported for this mailbox.
This error can occur for sandbox (test) accounts or for accounts that are on a dedicated (on-premise) mail server.

Possible Solutions

Summary: Mailbox needs to be migrated
REST API is not yet supported for this mailbox error for request to a mailbox

Summary: Correct license needs to be added
REST API is not yet supported for this mailbox

Related reading:
Issues with a Shared Mailbox

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I have previously configured Shared mailbox in Microsoft 365 admin center & sent an email using Power Automate successfully.

Flow configuration:

enter image description here

Output Email:

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Follow below steps to create a new Shared mailbox & grant necessary permissions:

  1. Create a shared mailbox from Microsoft 365 admin center or Exchange admin center

  2. Grant below permissions to your user account:

    • Read and manage permissions: to use shared mailbox in 'Send an email from a shared mailbox' action
    • Send as permissions: to use shared mailbox in 'Send an email (V2)' action

Read and manage permissions:

enter image description here

Send as permissions:

enter image description here


Note: Permissions changes can take up to 60 minutes to take effect.

Related reference: Send email from a common mailbox in Power Automate using Microsoft Teams email address or Shared Mailbox

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