Adding custom profile fields to awaiting activation email

[Scratchy101]

I've created some mandatory custom fields which a user must complete to register in the forum.

• member number
  
• first name
  
• last name
  

I would like to have the info from those fields displayed in the "Awaiting Activation" emails received by the admins.
I've searched hi and lo, but have only found a solution for a much older version of MyBB.

I've edited the member.lang.php under the Languages page and added this code which I found for the older version:
Member Number: {$post['fid4']}

This is what I received in the email:

There is a new user at CRYA Member Forums who is pending admin activation.

Username: test_activation_email
Member Number: {$post['fid4']}

Please review the user profile on the activation page here:
https://crya.ca/mybb/admin/index.php?mod...activation

Thank you,
CRYA Member Forums Staff

What is the variable to add these 3 custom fields to the email?
I am running the latest version of MyBB.