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TPM_E_INVALID_KEYUSAGE
The key was created for a different class of operation
TPM_E_INVALID_KEYUSAGE (0x80280024) means the key object exists but its usage attributes do not permit the requested TPM command. For example, a signing-only or storage key cannot be substituted freely into another cryptographic role.
Evidence to capture
Record key handle, key usage/type, algorithm parameters, migratable/storage/signing flags, command ordinal, and the key template used at creation. Verify the handle has not been reused for a different loaded key.
Focused correction
Use a key created with usage attributes compatible with the operation, or choose the operation that matches the existing key. Do not simply reload the same incompatible key and expect a state change.
Technical references
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