Fraudulent takeover

No. An unsolicited caller or pop-up claiming to be Microsoft support is a scam. Microsoft does not make unsolicited phone calls to fix a computer, and Microsoft error or warning messages never include phone numbers.

If remote access was allowed or any information was shared:

1. Disconnect the device from the internet.
2. Uninstall any application the scammer asked to install.
3. Run a full scan with Microsoft Defender Antivirus or another up-to-date antivirus product.
4. Change passwords after the malware scan is complete.
5. Check for unusual sign-in activity.
6. Contact the bank or card issuer if any payment information was given.
7. Report the scam at https://www.microsoft.com/reportascam.

If the concern is that a Microsoft account was compromised, use the Microsoft account recovery flow and scan the PC for malware before changing the password.

References:

• Protect yourself from tech support scams
• Protect yourself from online scams and attacks
• Tech support scams
• How to recover a hacked or compromised Microsoft account