Removing onmicrosoft.com Domain from SharePoint online

Question

How to remove tapan.mallick@[email protected] domain from my account .

 

I have synch my all UserName from AD but in people peacker , when i am trying to search a record, the same name is showing twice .

 

Example : My domain name is : xyz.com

 

Name is showing like ( Tapan Mallickl[tapan.mallick@xyz .com])

 

Same name showing twice ( Tapan Mallickl[ tapan.mallick@[email protected]])

 

Please suggest me , How to delete second name from People peacker in SahrePoint online ?