I'm stuck with itunesconnect. For testing my in-app purchase code of an iOS app I try to create a sandbox tester account, but all I get is "An unknown error has occurred."
As email address I use a gmail address like "myname+us@gmail.com" which is not an existing Apple ID.
The only weird thing I can see is the date-of-birth thing where I can specify month and day only (no year).
Has anyone experienced the same problem? Is that a problem inside itunesconnect or what can I do here? Any help is appreciated.
Andreas

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I can confirm that itunesconnect will reject common disposable emails. I had luck with pokemail.com (from guerrillamail.com) though. – Nik Bernaz Nov 26 '16 at 07:00
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i have tried using this trick but it won't work for me when i am going to add + sign in real email its showing me weird error like "this field is invalid" in password textbox but if i use "_" instead of "+" it will work. but can't get any verification mail please help you guys have solved this problem – bLacK hoLE Oct 05 '18 at 19:41
9 Answers
I had to use at least 1 upper case, 1 special char (like @), 1 punctuation mark and 1 lower case and be at least 8 digits long
I was getting simply 'This field is invalid' in the password when submitting - no guidance at all as to what was wrong - great UX Apple

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1- Thanks, it works. Password validation issue in my case. You are correct apple need to provide proper validation message at there. – PiyushRathi Jul 05 '19 at 08:21
I was just running into the same issue. I was able to finally get a test account through when i removed the +abcd from my address and just used another account I have.
So even though they say to use the +abcd thing it throws and "Unknown Error" when you try and use it.

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1You're right. I've just created successfully a sandbox tester with a standard email address. This is weird, because the iTunes Connect Developers Guide suggests explicitely to use subaddresses. See here: https://developer.apple.com/library/ios/documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/Chapters/SettingUpUserAccounts.html – Andreas Vogel Dec 31 '14 at 10:05
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Tried user1@spam4.me and user1@grr.la emails (there are from temp email service) without any luck... – Denis Maslov Jul 02 '15 at 13:00
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i have tried using this trick but it won't work for me when i am going to add + sign in real email its showing me weird error like "this field is invalid" in password textbox but if i use "_" instead of "+" it will work. but can't get any verification mail please help you guys have solved this problem – bLacK hoLE Oct 05 '18 at 19:40
I had the same error, but this wasn't my issue. In my case, I had created throwaway accounts that had 3 parts in the domain part of the email address - e.g. foo.bar.com. It turns out that won't work for iTunes, but two parts work fine - e.g. foo.com.
Thanks Apple for such a wonderfully opaque error message. Loved wasting a few hours on this.

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The problem for me was a weak password..
You need to use a "strong" password (at least 1 capital letter, 1 number and 1 punctuation char).
Really weird that the error message is unknown.

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This worked for me. Was also getting a "not helpful" error message. Cheers Apple! – Etienne Juneau Oct 22 '18 at 05:15
This is undocumented Apple behavior. They will block registration of email addresses that:
- Are already used on production app store
- Are already used on production app store but also use the
+
trick to make a sub mailbox on Gmail - Are mailinator addresses
- Are mailinator addresses but using an alternate domain (ayfs? yiafs.)
SOLUTION
- Create an MX record on a domain you control:
anon.domain.com
->mail.mailinator.com
- Register an address like
bob@anon.domain.com
- Now you can get the mail on mailinator for the mailbox named
bob

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Seems like using the @example.com
domain for email will return that error as well.

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I tried to use temporary email address to test IAPs and got the same problem. As soon as I changed it to popular email service - I was allowed to add it as sandbox tester.
Summarize everything that were said, looks like probably Apple doesn't allow to use fake or suspicious email addresses for that purposes.

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For me, when I used the email ending with
@icloud.com
none of the above method worked I tried keeping strong password including 1 punctuation , 1 Upper, 1 Lower, 1 Special and atleast 1 number
.
But as soon as I changed the domain to
@gmail.com
keeping the same configuration like above it worked for me.

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Nothing worked for me. Than opened a fresh gmail account and it worked.

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