Itunes says I don't have permission to connect to new phone

Thanks for posting this info.

The problem is your iTunes version is much too old to communicate to your iPhone.

Either you have a very old operating system or you have not updated your iTunes version in a long time.

Be certain you have the latest operating system version.

Upgrade to macOS Mojave - Official Apple Support

Abd if you’re not going to use Mojave because your computer is too old, get the latest iTunes version.

https://www.apple.com/iTunes/download

Again, if your operating system is too old and cannot be upgraded, you may not be able to solve this without purchasing a new computer.

What are the exact, complete set of words you see?

Where do you see them? In iTunes? On the iPhone?

What is iTunes’ version number?

MacOS Mojave uses iTunes 12.9. iTunes will be installed with Mojave.

Good luck!

Delighted that solved it for you.

Enjoy your new iPhone and your newly updated Mac!