company omnisharp completion

[Azizul7m]

It works like syntax highlighting, and error checking except for autocompletion I didn't get any auto suggestions.
But trigger omnisharp-auto-complete it comes out. like this.

This is my current config

(use-package csharp-mode
    :defer nil
    :init
      (require 'omnisharp)
      (add-hook 'csharp-mode-hook 'omnisharp-mode)
        (add-hook 'csharp-mode-hook #'flycheck-mode)
    :config
      (setq omnisharp-debug t)
      (setq omnisharp-server-executable-path
          "/usr/bin/omnisharp"))


(eval-after-load
 'company
 '(add-to-list 'company-backends 'company-omnisharp))

doom emacs and company