Windows Error Codes
Searchable reference for Windows error codes — system errors, BSOD stop codes, NTSTATUS, WMI, RPC, MSI installer, AD/Kerberos, BitLocker, DNS, VPN, Hyper-V, COM/DCOM and more. Each entry includes the hex/decimal value, severity, root causes, and a step-by-step troubleshooting workflow.
How to read a Windows error code
Windows surfaces error codes through Win32, NTSTATUS, HRESULT, and many subsystem-specific spaces. Each code has a hex form (e.g. 0x80070005), a signed decimal form (-2147024891), and a symbolic name (ERROR_ACCESS_DENIED). This page lets you look up any of those forms, see what triggers the code, and follow a vetted troubleshooting workflow tuned for the originating subsystem (Windows Update, BSOD, AD/Kerberos, BitLocker, etc.).
7 codes
0x8004FE21ErrorOFFICE_SUBSCRIPTION_ERROR
Microsoft 365 subscription issue. Sign out and back in to Office, or check license assignment.
0x8004FE33ErrorOFFICE_SUBSCRIPTION_NOT_FOUND
No valid Microsoft 365 subscription found for this account. Check license in M365 admin center.
0xC004B100ErrorSL_E_CHPA_PRODUCT_KEY_BLOCKED
The product key is blocked. It may have been reported as stolen or misused.
0xC004C003ErrorSL_E_ACTIVATION_FAILED
Office activation failed. The activation server determined the specified product key is blocked.
0xC004C060ErrorSL_E_GRACE_TIME_EXPIRED
Office grace period has expired. Activation required immediately.
0xC004F017ErrorSL_E_PRODUCT_SKU_NOT_INSTALLED
The software license product SKU is not installed.
0xC004F074ErrorSL_E_ACTIVATION_FAILED_KMS
KMS activation failed. No KMS host could be found. Check DNS SRV records or KMS host availability.