diff --git a/locales/en/app.json b/locales/en/app.json
index 8656502cf..3ff956a6a 100644
--- a/locales/en/app.json
+++ b/locales/en/app.json
@@ -205,6 +205,7 @@
     "blur_not_supported_by_browser": "(Background blur is not supported by this device.)",
     "developer_tab_title": "Developer",
     "devices": {
+      "activating": "Activating…",
       "camera": "Camera",
       "camera_numbered": "Camera {{n}}",
       "change_device_button": "Change audio device",
diff --git a/src/components/MediaMuteAndSwitchButton.test.tsx b/src/components/MediaMuteAndSwitchButton.test.tsx
index d9bcee1e9..fcc9f0b4e 100644
--- a/src/components/MediaMuteAndSwitchButton.test.tsx
+++ b/src/components/MediaMuteAndSwitchButton.test.tsx
@@ -180,12 +180,12 @@ describe("MediaMuteAndSwitchButton", () => {
     );
 
     await user.click(screen.getByRole("button", { name: "Microphone" }));
-    screen.getByRole("menuitem", { name: "Microphone 1" });
-    screen.getByRole("menuitem", { name: "Microphone 2" });
+    screen.getByRole("menuitemradio", { name: "Microphone 1" });
+    screen.getByRole("menuitemradio", { name: "Microphone 2" });
     await user.keyboard("[Escape]");
     await user.click(screen.getByRole("button", { name: "Camera" }));
-    screen.getByRole("menuitem", { name: "Camera 1" });
-    screen.getByRole("menuitem", { name: "Camera 2" });
+    screen.getByRole("menuitemradio", { name: "Camera 1" });
+    screen.getByRole("menuitemradio", { name: "Camera 2" });
   });
 
   test("calls select callback on menu click", async () => {
@@ -206,7 +206,9 @@ describe("MediaMuteAndSwitchButton", () => {
     );
 
     await user.click(getByRole("button", { name: "Microphone" }));
-    await user.click(screen.getByRole("menuitem", { name: "Microphone 2" }));
+    await user.click(
+      screen.getByRole("menuitemradio", { name: "Microphone 2" }),
+    );
 
     expect(onSelect).toHaveBeenCalledWith("mic2");
   });
@@ -228,7 +230,9 @@ describe("MediaMuteAndSwitchButton", () => {
     );
 
     await user.click(getByRole("button", { name: "Microphone" }));
-    await user.click(screen.getByRole("menuitem", { name: "Microphone 1" }));
+    await user.click(
+      screen.getByRole("menuitemradio", { name: "Microphone 1" }),
+    );
 
     expect(onSelect).not.toHaveBeenCalled();
   });
@@ -264,18 +268,24 @@ describe("MediaMuteAndSwitchButton", () => {
     const { getByRole } = renderComponent(<Wrapper />);
 
     await user.click(getByRole("button", { name: "Microphone" }));
-    await user.click(screen.getByRole("menuitem", { name: "Microphone 2" }));
+    await user.click(
+      screen.getByRole("menuitemradio", { name: "Microphone 2" }),
+    );
 
     expect(onSelectPressed).toHaveBeenCalled();
     expect(onOptionUpdated).not.toHaveBeenCalled();
     // After clicking, plannedSelection="mic2" but selectedOption is still "mic1",
-    // so a spinner should appear on the mic2 item
-    const mic2Item = screen.getByRole("menuitem", { name: "Microphone 2" });
-    expect(mic2Item.querySelector(".rotate")).toBeTruthy();
+    // so mic2 should be in an activating state
+    screen.getByRole("menuitemradio", {
+      name: "Microphone 2 Activating…",
+      checked: false,
+    });
 
-    // The currently-selected mic1 item should not have a spinner
-    const mic1Item = screen.getByRole("menuitem", { name: "Microphone 1" });
-    expect(mic1Item.querySelector(".rotate")).toBeNull();
+    // The currently-selected mic1 item should not be activating
+    screen.getByRole("menuitemradio", {
+      name: "Microphone 1",
+      checked: true,
+    });
     await act(async () => {
       // resolve the promise that acutally updates the select option.
       resolve();
@@ -284,7 +294,7 @@ describe("MediaMuteAndSwitchButton", () => {
 
     expect(onOptionUpdated).toHaveBeenCalled();
     // Spinner should now be gone since the selection has caught up
-    const mic2ItemAfter = screen.getByRole("menuitem", {
+    const mic2ItemAfter = screen.getByRole("menuitemradio", {
       name: "Microphone 2",
     });
     expect(mic2ItemAfter.querySelector(".rotate")).toBeNull();
@@ -336,11 +346,15 @@ describe("MediaMuteAndSwitchButton", () => {
     await user.click(getByRole("button", { name: "Microphone" }));
 
     // The selected item (mic2) renders both an IconOptions SVG and a CheckIcon SVG
-    const mic1Item = screen.getByRole("menuitem", { name: "Microphone 2" });
+    const mic1Item = screen.getByRole("menuitemradio", {
+      name: "Microphone 2",
+    });
     expect(mic1Item.querySelectorAll("svg").length).toBe(2);
 
     // The unselected item (mic1) only renders its IconOptions SVG
-    const mic2Item = screen.getByRole("menuitem", { name: "Microphone 1" });
+    const mic2Item = screen.getByRole("menuitemradio", {
+      name: "Microphone 1",
+    });
     expect(mic2Item.querySelectorAll("svg").length).toBe(1);
   });
 });
diff --git a/src/components/MediaMuteAndSwitchButton.tsx b/src/components/MediaMuteAndSwitchButton.tsx
index bd220330f..3e344dd3a 100644
--- a/src/components/MediaMuteAndSwitchButton.tsx
+++ b/src/components/MediaMuteAndSwitchButton.tsx
@@ -191,6 +191,7 @@ export const MediaMuteAndSwitchButton: FC<MediaMuteAndSwitchButtonProps> = ({
                     width={24}
                     height={24}
                     className={styles.itemIcon}
+                    aria-hidden
                   />
                 )
               }
@@ -201,10 +202,23 @@ export const MediaMuteAndSwitchButton: FC<MediaMuteAndSwitchButtonProps> = ({
                 onSelect?.(id);
               }}
               key={id}
+              role="menuitemradio"
+              aria-checked={selectedOption === id}
             >
-              {selectedOption === id && <CheckIcon width={24} height={24} />}
+              {selectedOption === id && (
+                <CheckIcon
+                  width={24}
+                  height={24}
+                  aria-hidden // A label would be redundant to aria-checked above
+                />
+              )}
               {selectedOption !== id && plannedSelection === id && (
-                <SpinnerIcon width={24} height={24} className={styles.rotate} />
+                <SpinnerIcon
+                  width={24}
+                  height={24}
+                  className={styles.rotate}
+                  aria-label={t("settings.devices.activating")}
+                />
               )}
             </MenuItem>
           );
diff --git a/src/room/LobbyView.test.tsx b/src/room/LobbyView.test.tsx
index e2bb06ccb..8cbe6be14 100644
--- a/src/room/LobbyView.test.tsx
+++ b/src/room/LobbyView.test.tsx
@@ -145,8 +145,7 @@ describe("LobbyView", () => {
       .querySelector("path")!
       .getAttribute("d");
     const primaryButtonSvgPath = container
-      .querySelector(".primaryButton")
-      ?.querySelector("path")
+      .querySelector("path")
       ?.getAttribute("d");
     expect(primaryButtonSvgPath).toBe(expectedSvgPath);
     expect(container).toMatchSnapshot();
@@ -169,8 +168,7 @@ describe("LobbyView", () => {
       .querySelector("path")!
       .getAttribute("d");
     const primaryButtonSvgPath = container
-      .querySelector(".primaryButton")
-      ?.querySelector("path")
+      .querySelector("path")
       ?.getAttribute("d");
     expect(primaryButtonSvgPath).toBe(expectedSvgPath);
     expect(container).toMatchSnapshot();
diff --git a/src/tile/TileAvatar.test.tsx b/src/tile/TileAvatar.test.tsx
index 248e6ff76..85977a715 100644
--- a/src/tile/TileAvatar.test.tsx
+++ b/src/tile/TileAvatar.test.tsx
@@ -6,22 +6,22 @@ Please see LICENSE in the repository root for full details.
 */
 
 import { expect, describe, it } from "vitest";
-import { render } from "@testing-library/react";
+import { render, screen } from "@testing-library/react";
 
 import { TileAvatar } from "./TileAvatar";
 
 describe("TileAvatar", () => {
   it("should show loading spinner when loading", () => {
-    const { container } = render(
+    render(
       <TileAvatar id="@a:example.org" name="Alice" size={96} loading={true} />,
     );
-    expect(container.querySelector(".loading")).toBeInTheDocument();
+    screen.getByLabelText("Loading…");
   });
 
   it("should not show loading spinner when not loading", () => {
-    const { container } = render(
+    render(
       <TileAvatar id="@a:example.org" name="Alice" size={96} loading={false} />,
     );
-    expect(container.querySelector(".loading")).not.toBeInTheDocument();
+    expect(screen.queryByLabelText("Loading…")).toBe(null);
   });
 });
diff --git a/src/tile/TileAvatar.tsx b/src/tile/TileAvatar.tsx
index 910a031dd..88208ff0c 100644
--- a/src/tile/TileAvatar.tsx
+++ b/src/tile/TileAvatar.tsx
@@ -7,6 +7,7 @@ Please see LICENSE in the repository root for full details.
 
 import { type FC } from "react";
 import { InlineSpinner } from "@vector-im/compound-web";
+import { useTranslation } from "react-i18next";
 
 import styles from "./TileAvatar.module.css";
 import { Avatar, type Props as AvatarProps } from "../Avatar";
@@ -17,11 +18,12 @@ interface Props extends AvatarProps {
 }
 
 export const TileAvatar: FC<Props> = ({ size, loading, ...props }) => {
+  const { t } = useTranslation();
   return (
     <div>
       {loading && (
         <div className={styles.loading}>
-          <InlineSpinner size={size / 3} />
+          <InlineSpinner size={size / 3} aria-label={t("common.loading")} />
         </div>
       )}
       <Avatar size={size} {...props} />