APPLE ID
The Apple ID i use on my MacBook is not accepted by my new iPhone..."This Apple ID is not available. Please create another one." Do I really need 2 separate ID's?
iPhone 14
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You do not need two but from the message you present it looks like you are trying to create a separate account instead of signing into the old one.
Read this document to learn how to sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support