New iPhone 16 won’t accept Apple Account password during setup

Re: " New iPhone 16 verification issue: "... won’t accept my password with a failed message and unknown error"

"i have lost my number on my old phone as it moves over but I can’t use the new handset as it won’t complete set up"

A few ideas:

If you haven't already seen it: Apple Support's guidance from the link below may be helpful:

Set up iPhone - Official Apple Support

Try checking you are signed in (to the new iPhone) with the correct Apple Account email address and password:

Sign in to your Apple Account on the web or in your device settings - Apple Support

If you have another "trusted" device or computer listed in your Apple Account, you can likely get a verification code from that (in Settings), to enter from the new iPhone..

See how to: Get a verification code and sign in with two-factor authentication - Apple Support

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If needed: See if you can sign in to your Apple Account online, and check / change / update any of the details

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Support / info / contact options: Apple Account Support Web-Site (link below):

NB: There is a "Get support" link (online chhat / phone / email tc.at the bottom

Apple Account - Official Apple Support

If all else fails: ( last resort option )

How to use account recovery when you can’t reset your Apple Account password - Apple Support