You're uploading it to Quest and the avatar has too many physbones, physbone components, audio sources that don't work on Quest and the file size is also probably too big. You'll need to do a ton of optimising to get that Quest
@Grey-chan Thank you I also found out that using BlendShapeLimitBreakTool helps you increase the sizes further without making it look unnatural. Also that's a nice tip on the butt physics!
Witchofasia You need to create a texture that excludes the eye sockets. You can do this in Blender, or get an "emission" texture, which makes the whites of the eyes glow like in anime.
