This is the #1 reason for failure. The system deletes the "activator" file before it can run. Go to > Privacy & Security > Windows Security . Click Virus & threat protection .
Check your internet connection. Many activators require a handshake with a KMS server. If you are behind a strict firewall or using a VPN, the activation request might be blocked. To help you get the right fix: Are you getting a (like 0x80070005)? Did you previously have Office 365 installed on this PC? Are you using a .bat script or an .exe program ? microsoft office 2021 con activador no funciona
If basic steps fail, you can use official Microsoft Support tools to diagnose the issue. Alternatively, you can clear cached credentials: Open . Select Windows Credentials . Remove all entries related to MicrosoftOffice16 or Office . Unlicensed Product and activation errors in Office This is the #1 reason for failure