iPhone 14 pro not signing into apple media services (all other devices are ok)

Hello, DW86.

You've done some great troubleshooting on this issue already. Thanks for taking those steps. Please review this article: If you can't connect to the App Store, iTunes Store, or other Apple services - Apple Support.

It guides you to:

1. "Check the system status page: Check Apple’s System Status page to see if there’s an outage for a service in your country or region.
2.  Make sure that your device is connected to the internet: Use any web browser to connect to any website. If nothing loads, use another device on the same network to see if it can connect to any website. If no other devices can access the internet, turn off your Wi-Fi router, then turn it on again to reset it. If you still can’t connect to your Wi-Fi network, contact your internet provider for more help. If only your first device can’t connect to the internet, get help with Wi-Fi on your iPhone, iPad, or iPod touch, Apple Watch, Apple TV, or Mac. If you use cellular service to connect to the internet on your iPhone or iPad, make sure that you have cellular data turned on for the app that you're using. To do this, open the Settings app, tap Cellular, then turn on Cellular Data.
3.  Update your software: Update to the latest version of iOS or iPadOS, macOS, tvOS, watchOS, or software for your non-Apple device. Then try to connect again.
4.  Check the date and time: Make sure that the date and time on your device are set correctly for your time zone.

• On your iPhone, iPad, iPod touch: Open the Settings app. Tap General, then tap Date & Time. Get more help with date and time.
• On your Mac: Open System Preferences, then choose Date & Time.
• On your Apple TV: Go to Settings > General > Date and Time.
• If the date and time are incorrect, update them or turn on the option to set date and time automatically."

Let us know if we can help with anything else at all or if this doesn't settle your issue. Thanks and have a fabulous day!