I have looked at this so many times, I can see it any more. I have installed Cryptpad. Here is a snippet from 
config.example.js:
/*
     *  CryptPad contains an administration panel. Its access is restricted to specific
     *  users using the following list.
     *  To give access to the admin panel to a user account, just add their public signing
     *  key, which can be found on the settings page for registered users.
     *  Entries should be strings separated by a comma.
     */
/*
    adminKeys: [
        //"[cryptpad-user1@my.awesome.website/YZgXQxKR0Rcb6r6CmxHPdAGLVludrAF2lEnkbx1vVOo=]",
    ],
*/
So why doesn't this work?
/*
    adminKeys: [
        "[elmussol@pad.elsmussols.net/BIGLONGSTRING=]",
    ],
*/