Self-Signed certificate error on Android App

I’m trying to log into my self-hosted Vaultwarden instance. It works fine in browsers, but on Android, I get the error: “Unable to Process Your Request”. I can only guess this is because of the certificate.

  • I’ve added the self-signed root certificate in Android settings (both as CA and WiFi cert).
  • A self-signed cert is required since this is a local network domain.
  • My URL format is example.com:5000—could this be causing the issue? There is no reverse proxy in place, the server is exposed directly.

How can I diagnose this? The error message provides no useful details.