Domain Mapping not working

I am really stuck with domain mapping. I have hired 2 people to try and get it to work and I had my host Flywheel look into it and they cant figure it out either. I really need it to work bad. I am getting this error Please edit your /www/wp-config.php and move the line define( 'SUNRISE', 'on' ); above the last require_once() in that file or make sure you updated sunrise.php.
I have done the above request multiple times - maybe I just did it wrong. I have granted access to the site and I am willing to provide FTP access if that would help. Could it be possible that cloud flare is causing the issue? If so feel free to remove it and see if that is the error. Thank you so much for your help.