there are a few things at play here. The path shouldn’t be 22, as that’s the server port, not the path. Your path should just be a single / character.
If you’re getting server 500 errors, you will want to look in your own server error logs and see if PHP is generating “Fatal Errors”. For SFTP connections to work in PHP, you’ll need to have the php7 ssh modules enabled. Your systems admin may need to do this.
Best
Jason