Hello Community,
I'm participating in the Power Up challenge and using a test/sandbox account (damibenj46@learnwithpowerup.onmicrosoft.com). When trying to create a connection to Office 365 Outlook in a Power Automate flow (for Send an email (V2) action), I get the error: "REST API is not supported yet for this mailbox. This error can occur for sandbox (test) accounts or for accounts that are on a dedicated (on-premise) mail server."
Steps I've tried:
1. Re-authenticating the connection in the action pane—fails with connection test error.
2. Creating a new connection—same issue.
3. Contacted Microsoft support—they suggested migrating mailbox to Exchange Online, but my account lacks admin permissions (shows "Switch to an account that has permission" in admin centers).
4. Verified mailbox type via PowerShell/Get-Mailbox—it's UserMailbox but appears sandbox-limited.
5. Tested flow: Trigger on Dataverse row modified (pp_status = Submitted), Compose for HTML table, then Send Email—fails at connection.
Attached error screenshot from connection creation.
Is this a known limitation for Power Up test accounts? Any workarounds like alternative connectors (e.g., Graph API via HTTP) or how to enable REST API without migration? Appreciate detailed steps.
Thanks!
