In the past, I used to use the same Gmail address for testing in-app purchasing (sandbox testing) by adding + sign to my email. For example, myemail+testYapp@gmail.com
Now I am no longer able to create such user as I get error
This email address is not available for use as an Apple ID. You may already have an Apple ID associated with this address. Please try again or sign in using your existing Apple ID.
I read that Google did not disable this as I can still us it on other places. But not any more on ItunesConnect Sanbox user page.
Can anyone confirm this? And is there a way round aside of creating a new Apple ID for each new tester?