We are experiencing an issue when inviting a user to join our Apple Developer Program team through App Store Connect Users and Access. The purpose of adding this user is to include them as an internal TestFlight tester after the invitation is accepted. The invited user received the Apple Developer invitation email and clicked the "Accept invitation" link. The invitation link opens the following page: https://appstoreconnect.apple.com/activation_ds?key=... The page displays "Sign in to accept your invitation" and asks the user to sign in with an Apple Account. After the user signs in successfully, the page redirects back to the same sign-in page and asks the user to sign in again. The invitation cannot be accepted, and the user cannot join the Apple Developer Program team. Steps to reproduce: Go to Users and Access in App Store Connect. Add a new user and send an invitation to join the Apple Developer Program team. The invited user receives the Apple Developer invitation email. The invited user clicks the "Accept invitation" link. The page opens appstoreconnect.apple.com/activation_ds. The user signs in with an Apple Account. After signing in, the page redirects back to the same sign-in page. Repeating the sign-in process results in the same redirect loop. Expected result: The invitation should be accepted after the user signs in, and the user should be added to the Apple Developer Program team. Actual result: The page keeps redirecting back to the sign-in page, and the user cannot accept the invitation. Troubleshooting already tried: Safari and Chrome Private browsing mode Clearing browser cookies Signing out of Apple ID before opening the invitation link again Opening the link directly in the browser instead of an email app embedded browser The issue still occurs.

We are experiencing an issue when inviting a user to join our Apple Developer Program team through App Store Connect Users and Access to testflight. The invited user received the Apple Developer invitation email and clicked the "Accept invitation" link. The invitation link opens the following page: https://appstoreconnect.apple.com/activation_ds?key=... The page displays "Sign in to accept your invitation" and asks the user to sign in with an Apple Account. After the user signs in successfully, the page redirects back to the same sign-in page and asks the user to sign in again. The invitation cannot be accepted, and the user cannot join the Apple Developer Program team. Steps to reproduce: Go to Users and Access in App Store Connect. Add a new user and send an invitation to join the Apple Developer Program team. The invited user receives the Apple Developer invitation email. The invited user clicks the "Accept invitation" link. The page opens appstoreconnect.apple.com/activation_ds. The user signs in with an Apple Account. After signing in, the page redirects back to the same sign-in page. Repeating the sign-in process results in the same redirect loop. Expected result: The invitation should be accepted after the user signs in, and the user should be added to the Apple Developer Program team. Actual result: The page keeps redirecting back to the sign-in page, and the user cannot accept the invitation. Troubleshooting already tried: Safari and Chrome Private browsing mode Clearing browser cookies Signing out of Apple ID before opening the invitation link again Opening the link directly in the browser instead of an email app embedded browser The issue still occurs.