Cannot add new user to my app team

I am having the same issue, just started to experience the last week. I have not experienced this before. I have confirmed the user is not added to the user list various times but I still cannot add them. It's very frustrating. We were also having issues allowing external testers download a beta version, which is why I was trying to add a developer on a different team to the developer team to allow them to download the latest a bit faster. Any help would be appreciated. This is affecting feature development so quick help on what is happening would be appreciated ❤️

Same here. Can't add new sandbox tester for IAP testing.

We'll need the impacted user's email address to investigate further. Can you please file a feedback report or follow up with support directly so we can look into the specific details?

Same issue here, Not showing in list or in search, can't add because "A user with this email address already exists on this team."

Same issue and it has happened many times. I can not understand what's happening with this unclear message.

I am having the same problem. The message is clearly wrong, since there's totally no user with the E-Mail address in my team. It's the one I am trying to add actually. This is a bug that needs to be fixed.

I am having the same problem.

Same problem happening here. I was able to add a sandbox user about a year ago, tried today and I got that error.

Same issue Here as well, this seems to be common enough to warrant a response.

Got into contact with Apple support. We can't add a user to sandbox testers if that user has a real Apple ID. So add an email address that hasn't been attached to an Apple ID.

Same...

Same. this issue is produced on following case.

1. login to app store connect and go to https://appstoreconnect.apple.com/access/users
2. login session expired but the browser isn't refreshed yet and i can see Users and Access page
3. trying to add a user: input a user email and clicks invite button on New User form. the browser will be refreshed and logged out because the login session is expired.
4. re-login app store connect and go to Users and Access page
5. then can't see and add this email using on step 3 in Users and Access page.

please fix

I have encountered the same issue. After checking "Users and Access" -> "People" / "Sandbox", the email is existed in "Sandbox". This issue is gone after removing the email from "Sandbox".