If your site shows a "Site Currently Unavailable" message, don’t worry. Start...

https://wiki-room.win/index.php/Site_Currently_Unavailable_After_Enabling_Maintenance_Mode:_What_You_Need_to_Know

If your site shows a "Site Currently Unavailable" message, don’t worry. Start by checking your DNS settings to ensure your domain points correctly. Verify your permissions to avoid 403 errors or review authentication if you see a 401