I checked the exact same config and App passord in an other setup (HomeAssistant) and it's working fine.
Logs shows:
Sun Mar 23 10:55:49 2025 mail.info sSMTP[10564]: Creating SSL connection to host
Sun Mar 23 10:55:49 2025 mail.info sSMTP[10564]: SSL connection using TLS_CHACHA20_POLY1305_SHA256
Sun Mar 23 10:55:50 2025 mail.err sSMTP[10564]: Authorization failed (535 5.7.8 https://support.google.com/mail/?p=BadCredentials 5b1f17b1804b1-43d4fd181b6sm81981215e9.9 - gsmtp)