X_SEAL_KEY_MISSING
Means
no master key to seal or open a value with
Typical cause
seal() / open() ran with ULTIMATE_SECRETS_KEY unset and no .secrets.key under the app root. Never a pass-through — a value that should have been sealed is refused, not stored as plaintext
Fix
x secrets init, or where the key already exists export ULTIMATE_SECRETS_KEY="$(cat .secrets.key)"