Changing the administrator username is very important for your Windows server security.
To change it on Windows server 2016/2019/2022
- Open "Server Manager"
- From the top menu, click
Tools
>Computer Management
- From the left side tree, click to expand "Local Users and Groups", then click on "Users"
- All users will appear in the middle panel
- Right-click on administrator or admin and click Rename
- When you finish hit Enter and restart your server then try to log in with the new username and the same old password.
- You can watch a video tutorial from this link:
https://www.youtube.com/watch?v=9tH7Ghg2OVg