diff --git a/playwright/e2e/crypto/backups-mas.spec.ts b/playwright/e2e/crypto/backups-mas.spec.ts
index 6519a484e9..6a7fff6672 100644
--- a/playwright/e2e/crypto/backups-mas.spec.ts
+++ b/playwright/e2e/crypto/backups-mas.spec.ts
@@ -23,7 +23,13 @@ test.describe("Encryption state after registration", () => {
     test("Key backup is enabled by default", async ({ page, mailpitClient, app }, testInfo) => {
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailpitClient, `alice_${testInfo.testId}`, "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(
+            page,
+            mailpitClient,
+            `alice_${testInfo.testId}`,
+            `alice_${testInfo.testId}@email.com`,
+            "Pa$sW0rD!",
+        );
 
         // Wait for the ui to load
         await expect(page.locator(".mx_MatrixChat")).toBeVisible();
@@ -35,7 +41,13 @@ test.describe("Encryption state after registration", () => {
     test("user is prompted to set up recovery", async ({ page, mailpitClient, app }, testInfo) => {
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailpitClient, `alice_${testInfo.testId}`, "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(
+            page,
+            mailpitClient,
+            `alice_${testInfo.testId}`,
+            `alice_${testInfo.testId}@email.com`,
+            "Pa$sW0rD!",
+        );
 
         await page.getByRole("button", { name: "Add room" }).click();
         await page.getByRole("menuitem", { name: "New room" }).click();
@@ -64,7 +76,7 @@ test.describe("Key backup reset from elsewhere", () => {
 
         await page.goto("/#/login");
         await page.getByRole("button", { name: "Continue" }).click();
-        await registerAccountMas(page, mailpitClient, testUsername, "alice@email.com", testPassword);
+        await registerAccountMas(page, mailpitClient, testUsername, `${testUsername}@email.com`, testPassword);
 
         await page.getByRole("button", { name: "Add room" }).click();
         await page.getByRole("menuitem", { name: "New room" }).click();
diff --git a/playwright/e2e/oidc/oidc-native.spec.ts b/playwright/e2e/oidc/oidc-native.spec.ts
index 14259b2ec5..a6fbf231ce 100644
--- a/playwright/e2e/oidc/oidc-native.spec.ts
+++ b/playwright/e2e/oidc/oidc-native.spec.ts
@@ -33,7 +33,7 @@ test.describe("OIDC Native", { tag: ["@no-firefox", "@no-webkit"] }, () => {
         await page.getByRole("button", { name: "Continue" }).click();
 
         const userId = `alice_${testInfo.testId}`;
-        await registerAccountMas(page, mailpitClient, userId, "alice@email.com", "Pa$sW0rD!");
+        await registerAccountMas(page, mailpitClient, userId, `${userId}@email.com`, "Pa$sW0rD!");
 
         // Eventually, we should end up at the home screen.
         await expect(page).toHaveURL(/\/#\/home$/, { timeout: 10000 });
@@ -83,7 +83,7 @@ test.describe("OIDC Native", { tag: ["@no-firefox", "@no-webkit"] }, () => {
             await page.getByRole("button", { name: "Continue" }).click();
 
             const userId = `alice_${testInfo.testId}`;
-            await registerAccountMas(page, mailpitClient, userId, "alice@email.com", "Pa$sW0rD!");
+            await registerAccountMas(page, mailpitClient, userId, `${userId}@email.com`, "Pa$sW0rD!");
 
             await expect(page.getByText("Welcome")).toBeVisible();
             await page.goto("about:blank");