Hi @Polly Wang
Thank you for posting your question in the Microsoft Q&A forum.
To better assistance, could you please confirm following information
- Are you using New Outlook or Classic Outlook or web version?
- What type of account is configured in Outlook?
- Does this issue occur on all devices or just one?
- When did the issue start? After an update, password change, or network change?
- What do you see in the Outlook status bar?
- Is this a corporate or personal account?
Could you please share the screenshot of the issue?
Your detailed response will help us diagnose and investigate the issue more efficiently. If I misunderstood what you’re looking for, feel free to let me know. I’d be happy to help further!
Thank you for your cooperation. I'm looking forward for your reply.