PDF signing fails with 'Keyset is not defined' (Error 2148073497)

Symptoms

Signing a PDF returns: 'The Windows Cryptographic Service Provider reported an error: The keyset is not defined. Error Code: 2148073497'.

Likely cause

The wrong CAC certificate was chosen for the signature operation (for example, the ID/Authentication cert was selected when only the EMAIL cert can sign that workflow, or vice versa).

Fix

1. Retry the signature. 2. When the certificate picker appears, switch to a different certificate than the one you tried last time. 3. If you tried 'DOD CA-xx' first, choose 'DOD EMAIL CA-xx' instead (or vice versa). 4. Complete the signature.

Sourced from militarycac.com. Rewritten for clarity.

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