Apple officially recommends using subaddressing (adding a '+' and text to an existing email address) to create new Sandbox Users here:
"If your email service provider supports email subaddressing with a plus character (+), use subaddresses of a standard address for each sandbox tester account. For example, if your base email is foo@example.com, use the foo+us@example.com, foo+uk@example.com, and foo+jp@example.com email addresses when creating sandbox tester accounts in iTunes Connect. All communications sent to the subaddresses are sent to the base address."
However, for some reason it stopped working. I had already created a couple of these accounts using subaddressing, but I cannot create more it seems. It gives the message:
"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 tried with 3 different accounts, some with and some without subaddressing accounts already. Is this something Apple doesn't want anymore?
