PDF signing fails with 'Security token has no storage space' (Error 2148073507)

Symptoms

Signature attempt fails with a message about insufficient storage on the smart card.

Likely cause

Incorrect certificate selected for signing; the chosen container does not have a usable signing key.

Fix

1. Click the signature field again. 2. In the certificate picker, choose a different certificate. 3. Toggle between DOD CA and DOD EMAIL CA options until one succeeds.

Sourced from militarycac.com. Rewritten for clarity.

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