Remove Apple ID from iPhone
I added an existing App account to a new phone and now it’s combined with other devices. Trying to reset to and remove but it’s not working
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That is what iCloud is supposed to do. It tries to match all the content on one device to any other devices signed in with that Apple ID.
What you do next has multiple solutions depending up what exactly you wish to do. You can simply sign in with a different account:
Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> https://support.apple.com/HT208242
If another Apple ID is signed in you may need to enter the password for that ID to sign out of that ID first.
Click on this link to learn how to 'Sign in with your Apple ID' --> https://support.apple.com/HT204053
You can entirely erase the iPhone and make it as if new:
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
You can erase the data:
How to erase your iPhone, iPad, or iPod touch - Apple Support
Alternatively, if you wish to use the same Apple ID on this phone but do not want iCloud to sync content: