New Member Registration - Email address is not being stored in the database

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Regarding console : it allows you to debug your code by printing messages, available in preview and browser’s consoles, just like you showed.
So in your case we want to know why a record is created with empty email. So I would add the following lines:

 .then((email) => { 
// check if there is an item for the user in the collection    
console.log("Email retrieved : " + email);            
userEmail = email;

and

  const toInsert = { "_id": userId, "email": userEmail                     };
 console.log("toInsert  :" + toInsert);

Execute in preview mode and tell us the result.