Material changed

I recently upgraded from Default RP to Universal RP and,
I didn’t get what I was expecting for the materials in my project. Most of the materials had changed to the color pink!

You must convert your materials to the URP.

To upgrade built-in Shaders:

  • Open your Project in Unity, and go to Edit > Render Pipeline > Universal Render Pipeline.
  • According to your needs, select either Upgrade Project Materials to URP Materials or Upgrade Selected Materials to URP Materials.

Note: These changes cannot be undone. Backup your Project before you upgrade it.

https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@7.1/manual/upgrading-your-shaders.html