My Apple ID won't let me access apps on my iPhone 6s

I

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i have purchased a new iPhone 6s I can sign in with my apple I d and password but if I try to install Facebook app it asked my to sign in again but then says sign in failed
 

Just_Me_D

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Re: my appel id wont let me access apps on my iphone 6s

Do you have separate Apple IDs for iCloud and the iTunes & App Store? If so, make sure you're inputting the passcode correctly. If the problem persists, please contact Apple Support to resolve it. Thanks.