Received phone calls claiming to be from MS about a security breach on my account

Yes. This matches a scam or phishing attempt, not legitimate Microsoft support behavior.

Key signs from the details provided:

1. Unsolicited phone calls claiming there is a problem with the account are a common tech support scam pattern.
2. The caller tried to get a verification or password reset code. If a code was not requested, it can mean someone is trying to access the account.
3. Microsoft says it will never proactively reach out to provide unsolicited technical support.
4. A genuine unusual sign-in alert may come by email or text, but the purpose is for account verification through official channels, not to read the code to a caller.
5. If unsure whether a message is genuine, the safe action is to avoid links and sign in directly at https://account.microsoft.com or https://account.live.com, which was already done.

What the supported information indicates:

• Microsoft uses text messages for security verification codes and alerts related to account activity.
• If a text or code was not requested, it could mean someone is trying to access the account, or someone entered the wrong phone number.
• Tech support scammers often call pretending to be Microsoft and try to create urgency, ask for personal information, or get remote access.
• Legitimate unusual sign-in emails from Microsoft account protection come from ******@accountprotection.microsoft.com.

Based on the account check described, not seeing unexpected security changes after signing in directly is consistent with a failed scam attempt.

References:

• What happens if there's an unusual sign-in to your account | Microsoft Support
• Why is Microsoft texting me? | Microsoft Support
• Protect yourself from online scams and attacks | Microsoft Support
• Received alert that my account was locked & wouldn't let me cancel - Microsoft Q&A
• Microsoft Spoof Phishing? - Microsoft Q&A