Please stay safe online. If you're ready to install the official version, you can visit the secure site to redeem a genuine key you've purchased.
Instead of using high-risk public keys, consider these official ways to access Office:
The key may belong to a different version of Office than the one installed on your device (e.g., a Microsoft 365 key will not activate Office 2019).
You've probably come across a product key that ends with Ymv8x while searching online. This specific key format has been widely used by Microsoft for various Office versions. However, finding a working key that ends with Ymv8x can be challenging.