How do I access my iTunes music library after transferring to a new iPhone in the US?

I bought a new iPhone 16 and transferred my old phone 15 to the new phone via a iCloud backup. My iTunes library transferred but is all gray-out and unavailable claiming it isn’t available in my region. I’m in the US and this is my entire music library I’ve had for over 20 years without issue. Many are CDs I owned years ago and digitized. The only songs that work are ones I’ve purchased from iTunes in the past 2 years. I’ve changed region to other country and back to US, restarted, tried different WiFi. Nothing helps.