'No digital ID for signing has been found' on dual-CAC user

windows

Symptoms

Outlook throws 'No digital ID for signing has been found' when sending encrypted email, especially for users with both military and civilian CACs.

Likely cause

AKO email address is on the wrong CAC.

Fix

1. Update the email address on the CAC at https://www.dmdc.osd.mil/self_service or at an ID card office. 2. Clear old certs per slide 23 of the Making_AKO_work_with_Internet_Explorer PDF.

Sourced from militarycac.com. Rewritten for clarity.

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