5.7.139 Authentication unsuccessful, account locked. Contact your administrator. [CH0PR03CA0090.namprd03.prod.outlook.com]

Mudassar Khan 6 Reputation points
2021-12-20T23:10:52.277+00:00

5.7.139 Authentication unsuccessful, account locked. Contact your administrator. [CH0PR03CA0090.namprd03.prod.outlook.com]

Using Gmail App to access outlook emails - when sending, I'm getting the above error.

Reset password, re-added account on Gmail, but every time I send it bounces back.

I think maybe the Outlook SMTP server has blocked Gmail server IP, but I can't find any detail of this in Exchange Admin center

Can anyone point me to the right direction on how to get this unblocked? I have full admin roles but it doesn't seem like this is blocked at

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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