Here are some of the most common reasons for not being able to sign in. Post back if you have questions about any of them. Some Apple Support options are posted below too.
'Your account has been disabled in the App Store and iTunes' https://support.apple.com/en-us/HT208856
If your Apple ID is locked or disabled https://support.apple.com/en-us/HT204106
If you forgot the passcode for your iPhone, or your iPhone is disabled https://support.apple.com/en-us/HT204306
Turn off Activation Lock https://support.apple.com/en-us/HT201441
Can't Get a verification code and sign in with two-factor authentication https://support.apple.com/en-us/HT204974
If you can't connect to the App Store, iTunes Store, or other Apple services https://support.apple.com/en-us/HT201400.
Apple Support Options
Get a call from Apple support to help solve your problem using this
link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362
Apple ID Support https://support.apple.com/apple-id
Apple Support Twitter https://twitter.com/AppleSupport
Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169
Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best support option
