The resignation OA is a pre-resignation batch. If there is no approval, you can express it in writing to the personnel and you can leave in 30 days. According to the provisions of the Labor Contract Law, the employer shall be notified in writing and may leave his post after 30 days.

Taking OA process means that resignees need to apply for resignation on the company's OA platform, and its main purpose is to realize paperless office mode and facilitate enterprise management.