Failed to connect to IMAP server imap.outlook.office365.com

(2) Share

Report

Posted on by SK-06051031-0

In Desktop flow of Power Automate, while using "Retrieve Email messages", I am getting error while doing Run. Error showing "Failed to connect to IMAP server imap.outlook.office365.com"

Categories:

Power Automate Desktop

Screenshot 2025-0...

I have the same question (0)

All responses (2)

Answers (0)

Suggested answer

Jon Unzueta 1,827 Super User 2025 Season 2 on at

Like (0)

Report
@SK-06051031-0

The error "Failed to connect to IMAP server imap.outlook.office365.com" in your Power Automate Desktop flow is likely due to one of the following common causes:

1. Modern Authentication Requirement

Microsoft has disabled basic authentication (like IMAP with username/password) for many tenants as of late 2022. IMAP now typically requires OAuth 2.0 authentication.

Solution:

IMAP with basic auth (username/password) may no longer work.

You need to use Microsoft Graph API or Office 365 Outlook connector in cloud flows instead of IMAP in desktop flows.

2. IMAP Not Enabled for the Mailbox

Even if IMAP is technically available, it must be enabled per mailbox.

Check:

Go to Microsoft 365 Admin Center → Users → Active Users → Select the user → Mail → Manage email apps.

Ensure IMAP is enabled.

🏷️ Tag me if you have any further questions or if the issue persists.

✅ Click "Accept as Solution" if my post helped resolve your issue—it helps others facing similar problems.

❤️ Give it a Like if you found the approach useful in any way.

Was this reply helpful? Yes No
Riyaz_riz11 3,891 Super User 2025 Season 2 on at

Like (0)

Report

Hi,

It might issue due to Environment administrator access.
Similar kind of error i faced due to organization environment admin will be restricting user to access via IMAP.

If I have answered your question, please mark it as the preferred solution. If you like my response, please give it a Thumbs Up.
Regards,
Riyaz

Was this reply helpful? Yes No