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There are two ways to bypass this Couple ways to do itissue.

 1.

Workaround 1: From Outlook Desktop App

1. Copy (Ctrl + C) the message from the shared mailbox and then paste (Ctrl + V) the message to your inbox.

2. Use the “Report Phishing” button to report it as spam.

3. Delete the message from your inbox.

OR

 2.

I use  

Workaround 2: https://outlook.office365.com/mail/ on the web

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Once into your mailbox you can click on the profile picture or your Initials in upper right corner of page and select open another mailbox

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Type in the email address or Mailbox name and select it and choose open

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Then simply select the message and click on the three dots to the right of the message and choose phish notify

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