| Software Version | Compatibility with YMV8X | Expected Result | | :--- | :--- | :--- | | | No | Invalid Product Key error. | | Office 2021 Retail | No | Key block error (0xC004C003). | | Office 2019 Retail | No | Key block error. | | Office 2019 Volume License (VL) | Yes (Blocked) | Requires a KMS host to bypass server check. | | Office 2016 Volume License (VL) | Yes (Blocked) | Requires a KMS host. |
This key belongs to a class of keys known as "MAK" (Multiple Activation Keys). MAK keys are designed for large organizations (businesses, schools, governments) to activate many computers with a single key. Microsoft Office Product Key Ending With Ymv8x
What the suffix means
For specific Office versions, you can use the VBS script method ( ospp.vbs /dstatus ) in the Office installation folder to see the last 5 characters of the active key. Risks of Publicly Shared Keys | Software Version | Compatibility with YMV8X |