Troubleshooting 550 5.7.708 error from EXO

From time to time, when you start Office 365 trial with Exchange Online license, after some time you happen to be cut off from email communication and you get this NDR: Remote Server returned 550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP.

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Office 365 domain ForceTakeOver

If you are an Office 365 administrator, I believe that you have experienced this scenario. The situation when you want to add a domain to an Office 365 tenant, but you cannot because it is blocked by a different tenant .

More specifically, a customer wants you to set up a domain in their current tenant and when you try to add the domain it keeps telling you that the domain is being used already.

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Have you ever encountered the Outlook “something went wrong” error, after you switched on Multi-Factor Authentication in Office 365?

If you have seen the screen below, you should definitely continue reading, because I’m gonna share with you very simple solution.

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