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SL_E_CHPA_INVALID_PRODUCT_KEY_LENGTH
SL_E_CHPA_INVALID_PRODUCT_KEY_LENGTH (0xc004c00e) is a Windows Software Licensing activation-service code. The product key was rejected because its length is invalid. A Windows product key has a fixed structure; check the source and the entry rather than trying modified or incomplete strings.
What to check
- Copy the key only from the original purchase record, device documentation, or approved license portal.
- Verify that the intended key is for Windows rather than an add-on or different Microsoft product.
- Use Activation settings to enter a legitimate key for the installed edition.
Microsoft: help with activation errors
Microsoft: Slmgr.vbs activation options
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