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Hi
When press send I sometimes get this msg.
Sending from a shared mailbox
Current authenticated context is not valid for this request. This occurs when a request is made to an endpoint that requires user sign-in. For example, /me requires a signed-in user. Acquire a token on behalf of a user to make requests to these endpoints. Use the OAuth 2.0 authorization code flow for mobile and native apps and the OAuth 2.0 implicit flow for single-page web apps."
So how to fix
I had the same issue.
Resolved as follow
1. Go to SMTP Mail Setup
2. Apply Office 365 Server Settings
3. Set Authentication to OAuth2.0
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