The method isAdmin() does not exist on Illuminate\Contracts\Auth\Authenticatable. It seems like you code against a sub-type of Illuminate\Contracts\Auth\Authenticatable such as Illuminate\Foundation\Auth\User.
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Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
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if ($user->/** @scrutinizer ignore-call */ isAdmin()) {
The expression return view('pages.admin.home') returns the type Illuminate\View\View which is incompatible with the documented return type Illuminate\Http\Response.
The expression return view('pages.user.home') returns the type Illuminate\View\View which is incompatible with the documented return type Illuminate\Http\Response.