Hi Anshul,
Thank you for using Microsoft products and making community posts.
For me to provide you help with this concern, I need to ask few question for me to get a better view.
Are you getting this error message on the Outlook application?
Is this the first time that you have set up this email account on the Outlook app?
Who is the email provider of the account ?
your response will be greatly appreciated.
Chan G
Microsoft Community Moderator