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I am an Admin, and I am attempting to make a managed user as a co-admin, but I receive the following pop-up:

"Admin and Co-admin roles must use a verified domain for the primary and secondary email address. Please try again."

How do I verify this individual's domain so that they can be a co-admin?

Hi Aled, 

Welcome to Box Community and glad to help! 

Box is adding zero-trust enhancements for Admins therefore, Admins are no longer be able to change/use an existing email address to be a public or unverified domains (such as gmail or yahoo) for their email address.

Add a managed domain by following these three separate tasks:

  1. Add the domain and get a unique code (also known as a hash).
  2. Create a new DNS record for the domain with the unique code.
  3. Validate the domain.

You may visit this article for the complete guide. 

Hope it helps!