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Fix "REST API Not Supported for Mailbox" Error in Power Automate Outlook
Question details
The user is encountering a "REST API is not yet supported for this mailbox" error when attempting to connect an Outlook mailbox to Power Automate.
- Product
- Microsoft Power Automate
- Device & OS
- not provided
- Scenario
- Configuring an Office 365 Outlook trigger or action within a Power Automate flow.
- Observed behavior
- Power Automate halts and displays an error message stating that the REST API is not supported for the connected mailbox, preventing the automation from running.
Ensure you have administrator access to your Microsoft 365 account or contact your IT department, as you may need to check mailbox hosting details and user licenses.
Verify Mailbox Hosting, Tenant, and License Requirements
Determine if your mailbox is hosted on a supported platform (like Exchange Online) and ensure the correct licenses are applied.
The Office 365 Outlook connector in Power Automate relies on specific REST APIs that are natively supported by Exchange Online. If your mailbox is hosted on an on-premises Exchange server or lacks the proper Microsoft 365 licensing, the API calls will fail.
Confirm whether your email account is hosted in Exchange Online, Outlook.com, or an on-premises Exchange server. You can check this by logging into Outlook on the Web; if the URL is 'outlook.office.com', it is Exchange Online.
Log into the Microsoft 365 Admin Center, navigate to 'Users' > 'Active users', select the account experiencing the error, and verify that it has an active Power Automate license and a valid Exchange Online plan.
If you are using an on-premises Exchange mailbox, remove the 'Office 365 Outlook' connector from your flow. Instead, search for and add the standard 'Exchange' connector, which is designed for on-premises compatibility.
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Frequently Asked Questions
Why does Power Automate say REST API is not supported?
This error typically occurs when connecting to an on-premises Exchange mailbox or a dedicated mailbox that has not been migrated to Exchange Online, which natively supports the Outlook REST APIs used by most Power Automate connectors.
Can I use Power Automate with an on-premises Exchange server?
Yes, but you cannot use the 'Office 365 Outlook' connector. You must use the dedicated 'Exchange' connector and may also need to configure an on-premises data gateway to allow Power Automate to access your local server securely.
Does a personal Outlook.com account support Power Automate REST APIs?
Yes, standard Outlook.com accounts generally support the required APIs, but you must ensure you are using the specific 'Outlook.com' connector in your flow, rather than the enterprise 'Office 365 Outlook' connector.
How do I check if my mailbox is hosted on Exchange Online?
You can verify this by logging into your email via a web browser. If the address bar shows 'outlook.office.com', your mailbox is hosted on Exchange Online. If you are unsure, consult your IT administrator to confirm your Microsoft 365 hosting status.
