Even if you bypass the initial activation, Microsoft regularly checks activation statuses via background updates. When their servers detect the YMV8X key being used on 10,000 computers across 50 countries (when the license was only sold to one university in Ohio), they shut it down. Your Office will revert to "Reduced Functionality Mode" (Read-only, cannot edit documents) within 30 days. You will lose access to unsaved work mid-session.
This specific sequence (often part of a key like BKQ7D-G39C4-JR3GC-69GDR-YMV8X ) is a default key used by PC manufacturers (OEMs) to pre-install Office 2013, 2016, or 2019 "Ready" images on new laptops and desktops. Microsoft Office Product Key Ending With Ymv8x