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Hello. My name is ***** ***** I will be assisting you today.
Lots of people are having this issue today, the latest update has a bug in it. You will need to plug your iphone into your computer and open up itunes.From there it will show you what your apple ID is, if you don't know your password. You can reset it from here --> https://iforgot.apple.com
Checking in to see if you still need help with this issue, if so please reply at your convenience.