- Use importPKCS8 to convert private key string to CryptoKey - Pass CryptoKey to SignJWT.sign() instead of string - Fix 'Key for RS256 algorithm must be CryptoKey' error 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>