Certificates:

Gagnon Design RVA Root CA for Vaultwarden/iPhone (.pem). SHA-256 fingerprint: D5:27:BD:4B:06:4F:80:32:4E:2E:76:BD:8D:DF:E8:C3:5A:8B:5E:01:14:89:9D:0A:85:32:55:79:AE:47:2A:A5. After installing the profile, enable full trust under Settings > General > About > Certificate Trust Settings.