Microsoft provides an automated tool to fix license issues.
Provide vendor support with: the exact error code 0xc03f6601, product/version, license file, installer logs, and the diagnostic checklist items above. Microsoft provides an automated tool to fix license issues
cd %ProgramFiles%\Microsoft Office\root\Licenses16\ " you have identified Vector A.
The error typically appears in the Client-Licensing event logs when Windows or a Store app fails to validate a digital license . In most cases, "License Type: 1" refers to the core OS activation or a primary application subscription, such as an upgrade from Windows Pro to Windows Enterprise. Core Causes Microsoft provides an automated tool to fix license issues
Look at the line. Does it say "Evaluation"? If yes, you have identified Vector C. If it says "KMS Client Setup Key," you have identified Vector A.