diff --git a/playwright/e2e/launch/launch.spec.ts b/playwright/e2e/launch/launch.spec.ts
index 2d3f21e2..25c7a367 100644
--- a/playwright/e2e/launch/launch.spec.ts
+++ b/playwright/e2e/launch/launch.spec.ts
@@ -12,17 +12,19 @@ import keytar from "keytar-forked";
 import { test, expect } from "../../element-desktop-test.js";
 
 declare global {
+    interface ElectronPlatform {
+        getEventIndexingManager():
+            | {
+                  supportsEventIndexing(): Promise<boolean>;
+              }
+            | undefined;
+        getPickleKey(userId: string, deviceId: string): Promise<string | null>;
+        createPickleKey(userId: string, deviceId: string): Promise<string | null>;
+    }
+
     interface Window {
         mxPlatformPeg: {
-            get(): {
-                getEventIndexingManager():
-                    | {
-                          supportsEventIndexing(): Promise<boolean>;
-                      }
-                    | undefined;
-                getPickleKey(userId: string, deviceId: string): Promise<string | null>;
-                createPickleKey(userId: string, deviceId: string): Promise<string | null>;
-            };
+            get(): ElectronPlatform;
         };
     }
 }
diff --git a/playwright/e2e/launch/oidc.spec.ts b/playwright/e2e/launch/oidc.spec.ts
new file mode 100644
index 00000000..4b321271
--- /dev/null
+++ b/playwright/e2e/launch/oidc.spec.ts
@@ -0,0 +1,36 @@
+/*
+Copyright 2025 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { test, expect } from "../../element-desktop-test.js";
+
+declare global {
+    interface ElectronPlatform {
+        getOidcCallbackUrl(): URL;
+    }
+
+    interface Window {
+        mxPlatformPeg: {
+            get(): ElectronPlatform;
+        };
+    }
+}
+
+test.describe("OIDC Native", () => {
+    test.slow();
+
+    test.beforeEach(async ({ page }) => {
+        await page.locator(".mx_Welcome").waitFor();
+    });
+
+    test("should use OIDC callback URL without authority component", async ({ page }) => {
+        await expect(
+            page.evaluate<string>(() => {
+                return window.mxPlatformPeg.get().getOidcCallbackUrl().toString();
+            }),
+        ).resolves.toBe("io.element.desktop:/vector/webapp/");
+    });
+});
diff --git a/src/electron-main.ts b/src/electron-main.ts
index a47ed6cf..262e19c2 100644
--- a/src/electron-main.ts
+++ b/src/electron-main.ts
@@ -44,7 +44,12 @@ const argv = minimist(process.argv, {
 if (argv["help"]) {
     console.log("Options:");
     console.log("  --profile-dir {path}: Path to where to store the profile.");
-    console.log("  --profile {name}:     Name of alternate profile to use, allows for running multiple accounts.");
+    console.log(
+        `  --profile {name}:     Name of alternate profile to use, allows for running multiple accounts.\n` +
+            `                         Ignored if --profile-dir is specified.\n` +
+            `                         The ELEMENT_PROFILE_DIR environment variable may be used to change the default profile path.\n` +
+            `                         It is overridden by --profile-dir, but can be combined with --profile.`,
+    );
     console.log("  --devtools:           Install and use react-devtools and react-perf.");
     console.log(
         `  --config:             Path to the config.json file. May also be specified via the ELEMENT_DESKTOP_CONFIG_JSON environment variable.\n` +
@@ -75,7 +80,7 @@ if (userDataPathInProtocol) {
 } else if (argv["profile-dir"]) {
     userDataPath = argv["profile-dir"];
 } else {
-    let newUserDataPath = app.getPath("userData");
+    let newUserDataPath = process.env.ELEMENT_PROFILE_DIR ?? app.getPath("userData");
     if (argv["profile"]) {
         newUserDataPath += "-" + argv["profile"];
     }