It should be supported, do you see this in creating the flow? Is the email a trigger or action? I just created a flow with Office 365-on new email, It works for me, could you give me the detail error message or screenshot for that?
do you happen to know what license was assigned? I have the same error message whit a flow that we've created which sends out an email as soon as a doc is created in a SharePoint library.
The flow errors out with message "REST API is not yet supported for this mailbox license". The user is an Office 365 user with a Business Essentials license.
I know this has been a minute since you asked the question but I figured if you hadn't gotten an answer yet maybe you still needed it.
I believe the user in question would need a license that includes SharePoint and maybe Exchange depending on how you trigger the mail send. I don't believe the Business Essentials license includes either of those.
I hit a similar issue with wanting to build a Flow based on a shared mailbox recieving messages and I'm pretty sure it needs at the very least an Exchange Plan 1 license in order for me to tag into it and monitor that box. I'm wrong please someone let me know.
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