PIV Error 4020 'Middleware is either improperly installed or not installed at all'
Symptoms
Error 4020 at PIV activation.
Likely cause
ActivClient is missing or too old.
Fix
1. Install the latest ActivClient (ActivID 7.1.0.153 or 7.4).
2. Reboot.
3. Retry PIV activation.
Sourced from militarycac.com. Rewritten for clarity.
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