diff --git a/playwright/e2e/crypto/backups-mas.spec.ts b/playwright/e2e/crypto/backups-mas.spec.ts
index 614bde5064..1838f9e234 100644
--- a/playwright/e2e/crypto/backups-mas.spec.ts
+++ b/playwright/e2e/crypto/backups-mas.spec.ts
@@ -19,19 +19,19 @@ test.use(masHomeserver);
 test.describe("Encryption state after registration", () => {
     test.skip(isDendrite, "does not yet support MAS");
 
-    test("Key backup is enabled by default", async ({ page, mailhogClient, app }) => {
+    test("Key backup is enabled by default", async ({ page, mailhogClient, app }, testInfo) => {
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailhogClient, "alice", "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(page, mailhogClient, `alice_${testInfo.testId}`, "alice@email.com", "Pa$sW0rD!");
 
         await app.settings.openUserSettings("Security & Privacy");
         await expect(page.getByText("This session is backing up your keys.")).toBeVisible();
     });
 
-    test("user is prompted to set up recovery", async ({ page, mailhogClient, app }) => {
+    test("user is prompted to set up recovery", async ({ page, mailhogClient, app }, testInfo) => {
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailhogClient, "alice", "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(page, mailhogClient, `alice_${testInfo.testId}`, "alice@email.com", "Pa$sW0rD!");
 
         await page.getByRole("button", { name: "Add room" }).click();
         await page.getByRole("menuitem", { name: "New room" }).click();
@@ -45,8 +45,13 @@ test.describe("Encryption state after registration", () => {
 test.describe("Key backup reset from elsewhere", () => {
     test.skip(isDendrite, "does not yet support MAS");
 
-    test("Key backup is disabled when reset from elsewhere", async ({ page, mailhogClient, request, homeserver }) => {
-        const testUsername = "alice";
+    test("Key backup is disabled when reset from elsewhere", async ({
+        page,
+        mailhogClient,
+        request,
+        homeserver,
+    }, testInfo) => {
+        const testUsername = `alice_${testInfo.testId}`;
         const testPassword = "Pa$sW0rD!";
 
         // there's a delay before keys are uploaded so the error doesn't appear immediately: use a fake
diff --git a/playwright/e2e/login/login-sso.spec.ts b/playwright/e2e/login/login-sso.spec.ts
index fbe190b935..22428af502 100644
--- a/playwright/e2e/login/login-sso.spec.ts
+++ b/playwright/e2e/login/login-sso.spec.ts
@@ -17,13 +17,13 @@ test.use(legacyOAuthHomeserver);
 test.describe("SSO login", () => {
     test.skip(isDendrite, "does not yet support SSO");
 
-    test("logs in with SSO and lands on the home screen", async ({ page, homeserver }) => {
+    test("logs in with SSO and lands on the home screen", async ({ page, homeserver }, testInfo) => {
         // If this test fails with a screen showing "Timeout connecting to remote server", it is most likely due to
         // your firewall settings: Synapse is unable to reach the OIDC server.
         //
         // If you are using ufw, try something like:
         //    sudo ufw allow in on docker0
         //
-        await doTokenRegistration(page, homeserver);
+        await doTokenRegistration(page, homeserver, testInfo);
     });
 });
diff --git a/playwright/e2e/login/soft_logout_oauth.spec.ts b/playwright/e2e/login/soft_logout_oauth.spec.ts
index 19b1fc0124..f6814d0cf4 100644
--- a/playwright/e2e/login/soft_logout_oauth.spec.ts
+++ b/playwright/e2e/login/soft_logout_oauth.spec.ts
@@ -26,8 +26,8 @@ test.use({
 test.use(legacyOAuthHomeserver);
 test.describe("Soft logout with SSO user", () => {
     test.use({
-        user: async ({ page, homeserver }, use) => {
-            const user = await doTokenRegistration(page, homeserver);
+        user: async ({ page, homeserver }, use, testInfo) => {
+            const user = await doTokenRegistration(page, homeserver, testInfo);
 
             // Eventually, we should end up at the home screen.
             await expect(page).toHaveURL(/\/#\/home$/);
diff --git a/playwright/e2e/login/utils.ts b/playwright/e2e/login/utils.ts
index cc98d8819a..e7121159f0 100644
--- a/playwright/e2e/login/utils.ts
+++ b/playwright/e2e/login/utils.ts
@@ -6,7 +6,7 @@ SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Com
 Please see LICENSE files in the repository root for full details.
 */
 
-import { Page, expect } from "@playwright/test";
+import { Page, expect, TestInfo } from "@playwright/test";
 
 import { Credentials, HomeserverInstance } from "../../plugins/homeserver";
 
@@ -15,6 +15,7 @@ import { Credentials, HomeserverInstance } from "../../plugins/homeserver";
 export async function doTokenRegistration(
     page: Page,
     homeserver: HomeserverInstance,
+    testInfo: TestInfo,
 ): Promise<Credentials & { displayName: string }> {
     await page.goto("/#/login");
 
@@ -35,7 +36,7 @@ export async function doTokenRegistration(
 
     // Synapse prompts us to pick a user ID
     await expect(page.getByRole("heading", { name: "Create your account" })).toBeVisible();
-    await page.getByRole("textbox", { name: "Username (required)" }).fill("alice");
+    await page.getByRole("textbox", { name: "Username (required)" }).fill(`alice_${testInfo.testId}`);
 
     // wait for username validation to start, and complete
     await expect(page.locator("#field-username-output")).toHaveText("");
diff --git a/playwright/e2e/oidc/oidc-native.spec.ts b/playwright/e2e/oidc/oidc-native.spec.ts
index 63cf0a5b59..eb268c5ccc 100644
--- a/playwright/e2e/oidc/oidc-native.spec.ts
+++ b/playwright/e2e/oidc/oidc-native.spec.ts
@@ -17,7 +17,13 @@ test.describe("OIDC Native", { tag: ["@no-firefox", "@no-webkit"] }, () => {
     test.skip(isDendrite, "does not yet support MAS");
     test.slow(); // trace recording takes a while here
 
-    test("can register the oauth2 client and an account", async ({ context, page, homeserver, mailhogClient, mas }) => {
+    test("can register the oauth2 client and an account", async ({
+        context,
+        page,
+        homeserver,
+        mailhogClient,
+        mas,
+    }, testInfo) => {
         const tokenUri = `${mas.baseUrl}/oauth2/token`;
         const tokenApiPromise = page.waitForRequest(
             (request) => request.url() === tokenUri && request.postDataJSON()["grant_type"] === "authorization_code",
@@ -25,7 +31,7 @@ test.describe("OIDC Native", { tag: ["@no-firefox", "@no-webkit"] }, () => {
 
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailhogClient, "alice", "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(page, mailhogClient, `alice_${testInfo.testId}`, "alice@email.com", "Pa$sW0rD!");
 
         // Eventually, we should end up at the home screen.
         await expect(page).toHaveURL(/\/#\/home$/, { timeout: 10000 });