Poiyomi Shaders are the MOST used for avatars. If your materials are bright solid pink you imported the incorrect version of the shader. To fix, select all the materials the avatar uses and change to Poiyomi.
In addition to Poiyomi errors, sometimes the Hue changes and options for a model will not carry over to other versions of the shader. If the material has a Hue Shift toggled anywhere, right click next to the highlighted option above and it will add a clock like icon, this should fix the Hue toggle in game.
Quest DOES NOT have proper supported shaders, you must use VRChat Mobile shaders.
Import ALL the proper shaders before the avatar package. DO NOT replace already imported shaders, doing so will cause a fail to compile error. Some avatars come with proper shaders and if you do not want to use those shaders, uncheck them before importing the avatar package.