There is a common point of confusion. Within the standard YouTube app (under your profile picture > "Your data in YouTube" > "Try experimental features"), Google offers public experiments. These are not the same as the TestFlight beta.
To get the highest level of access, you need TestFlight.
Assuming you have been lucky enough to obtain a live invite link (from a friend, a Discord server alert, or a timely tweet), here is the exact installation process.
Prerequisites:
The Installation Walkthrough:
Step 1: Get the Invite Link Receive the link via iMessage, email, or Twitter. Do not open it in an in-app browser (like the Twitter or Reddit browser).
Step 2: Open in Safari Copy the link and paste it into Safari. This ensures proper universal linking. youtube beta testflight install
Step 3: Accept the Invite You will see a page that says "Become a tester for YouTube."
Step 4: Redirect to TestFlight Safari will automatically open the TestFlight app. You will see the YouTube beta page with details about the current build (version number, what’s new, expiration date).
Step 5: Install the Beta Tap the "Install" button (or "Update" if you already have a previous beta). There is a common point of confusion
Step 6: Wait for the Download The app icon will appear on your home screen with a yellow dot (for the first build) or no dot (for subsequent updates). Under the icon, it might say "Beta" in small text depending on your iOS version.
Step 7: Trust the Certificate (Unlikely, but possible) In rare cases, iOS will ask you to verify the developer certificate. Go to Settings > General > VPN & Device Management > Google, Inc. > Tap "Trust."
Step 8: Launch and Sign In Open the new YouTube beta. It will look nearly identical to the stable version, but check the settings menu—there is often a new "Beta" section or a "Send Feedback" button floating somewhere in the UI. To get the highest level of access, you need TestFlight
Congratulations. You have completed the YouTube beta TestFlight install.
Go to YouTube App > Profile Picture > Settings > About. Look for a build number that includes "beta" or a very high version number (e.g., 19.10.1 vs the public 18.49.3). You have successfully installed the YouTube beta.