License Install Failed For License Type: 1 Result Code: 0xc03f6601 |top| Jun 2026

In Microsoft’s error schema, 0xc03f6601 maps to SL_E_CHPA_PRODUCT_KEY_NOT_INSTALLED or a related activation failure, indicating that the product key cannot be applied because the licensing conditions are not met—either the key is blocked, mismatched with the current OS edition, or the licensing service cannot write the new license.

The Client License Service (ClipSVC) is responsible for managing Store-based licenses. If it can't find a valid "device license," it throws this error. Recent Windows updates (like KB5036980) have been known

Recent Windows updates (like KB5036980) have been known to cause "subscription activation" failures, where a device fails to upgrade from Pro to Enterprise. Press , type wsreset

Attempting to activate a Home edition of Windows with a Pro or Enterprise key can trigger installation failures. and hit Enter .

If the error occurs while downloading apps, resetting the Store's cache can clear licensing hang-ups. Press , type wsreset.exe , and hit Enter .