Check the email headers to determine whether the message originated from Microsoft. More at https://learn.microsoft.com/en-us/answers/questions/4652044/how-to-see-senders-address-when-the-spam-seems-to
Regarding responding to this email, refer to https://learn.microsoft.com/en-us/answers/questions/2264329/i-got-this-email-what-is-it-about-action-required
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hth
Marcin