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I'm getting same suspicious email, but I don't see a matching login under "Review recent activity" as Igor suggested below. So, I think someone is spoofing things and Microsoft needs to investigate. It seems to have an authentic Microsoft cert, but links from email look bogus. I'm reporting this as phishing via Outlook, but I'm sure it will just go into a deep, deep inbox. Here is what the email says:
| Microsoft account |
|---|
| Unusual sign-in activity |
| We detected something unusual about a recent sign-in to the Microsoft account {my account name} |
| Sign-in details |
| Country/region: Russia/Moscow |
| IP address: 103.225.77.255 |
| Date: Sun, 13 Mar 2022 20:35:39 +0000 |
| Platform: Xiaomi Redmi K30 Ultra |
| Browser: Brave Browser |
| A user from Russia/Moscow just logged into your account from a new device, If this wasn't you, please report the user. If this was you, we'll trust similar activity in the future. |