A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Hi Ting Li,
Thanks for your query in this community.
May I confirm which Exchange environment are you trying to connect? Is it your local Exchange Server or Exchange Online? Since you mentioned the "Microsoft Exchange Autodiscover Service dialog box", according to the following article, you are more like an Exchange on-premise user.
Connect to Exchange (Power Query)
In that scenario, I would suggest you raising a new thread in TechNet forum, which is a specific forum for discussing issue occurring under Exchange Server environment.
Regards,
Alex Chen