From aa63a1d47bbc02aaf2fd3914921cd3c67f089575 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Pila=C5=99?=
 <33516559+jnko266@users.noreply.github.com>
Date: Tue, 20 Oct 2026 21:50:38 +0200
Subject: [PATCH] Fix for #3931

---
 server/routers/auth/securityKey.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/server/routers/auth/securityKey.ts b/server/routers/auth/securityKey.ts
index 906474e9b..fe18a81d7 100644
--- a/server/routers/auth/securityKey.ts
+++ b/server/routers/auth/securityKey.ts
@@ -230,6 +230,7 @@ export async function startRegistration(
             rpID,
             userID: isoBase64URL.toBuffer(user.userId),
             userName: user.email || user.username,
+            userDisplayName: user.name || user.email || user.username, // Safari fails to register a passkey with empty display name - #3931
             attestationType: "none",
             excludeCredentials,
             authenticatorSelection: {