Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.
Based on the details you provided, this appears to be a phishing or scam message, not a legitimate Microsoft notification. Please take the following actions:
- Do not open the attachment or RSVP to the event
- Do not click any links or reply to the sender
- Report the message as Phishing in Outlook
- Delete the calendar invite and the associated email after reporting
- To verify your domain or subscription status, sign in directly to the Microsoft 365 Admin Center (do not use any links from the message)
- If you are unsure, your IT administrator can assist with reviewing and confirming this safely.
For additional guidance: Protect yourself from phishing
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