Version: Vaultwarden 1.35.2
I upgraded my bitwarden CLI to 2025.12.1 and my script failed with “Error: User Decryption Options are required for client initialization. userDecryptionOptions is missing in response.”. It turns out this was logged and already fixed here.
I downgraded back to bw CLI 2024.11.1 (yes very old) and it works. Anyone planning to upgrade bw CLI may want to hold off until the fix makes it into the stable vaultwarden release.