Share your route file where you have defined the route name admin.customerInfo.show. Alternatively to get the customer data you have to do route model binding. Link to official documentation

https://laravel.com/docs/9.x/helpers#method-route in your route('admin.customerInfo.show', ['customer'=> $loanApplication->user_id])

also in your controller method you should have something like public function show(CustomerInfoModel $customer) laravel will automatically match your url paramater with your medel and make an instance, unless you have a POST route method and need the request object in that case your method sould look something like public function show(Request $request, CustomerInfoModel $customer)

i ussualy preffer to have something like

  public function show(int  $customerId){
    
          $customer = Customer::where('id', $customerId)
          ...
          ->conditions
          ...
          ->first()
  }

so that i can add extra conditions to my queries and not instantiate the model if not all DB conditions are meet