Can I request another Apple ID to set up my Iphone
Why I can’t sign in in my iPhone
iPhone 6s Plus
Why I can’t sign in in my iPhone
iPhone 6s Plus
See if it is related to things discussed in the document you were reading before you posted here --> If you see a Could Not Create Apple ID or Could Not Set Up iCloud message - Apple Support
If it isn't one of those then you will have to provide much more information such as what exactly happens when you try to sign in and exact error messages you see.
request another Apple ID to use with this iPhone
Can I request another Apple ID to set up my Iphone