Hi, renaming wp-admin path name is working fine in latest version of WP, and in our demo site it’s working too.
As you are using Nginx server, you’ll need to do these after you enter new name for “wp-admin” & hit save settings button:

1) click on ‘nginx configuration’ button and add HMWP rules in nginx config file (overwrite previous HMWP rules), and restart Nginx.
2) Add the given line of code in wp-config.php file (as mentioned there)
3) click on “I did it! login to new dashboard” button, and login again. wp-admin paths should now be changed to the new name you specified.
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This reply was modified 6 years, 8 months ago by
Suman M..