This is because all edu website keep verifying the spam happening in their domain and they delete it. For example when i placed order for 100 edu profile link 5 months back, all were live at the time of delivery but when i checked after 2 month, most of them had 404 error only 47 out of 100 was...
You might be using public number available online and having accessible to 1000's of other guys. The issue is even when you verify it with real number and someone login through different IP, it may again ask to enter verification code, what would you do in such case.
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