We have changed the domain of our company and some users have their account tied to the old domain. In at least one case, I tried to have a user change their email address under their Account Settings, but they received a message that they already have an account with that email. Is there an efficient way to force the update to their new domain email accounts from the Admin Console or by another process?
@Support Is there any way you can assist with this?
We have reached out to to assist further 
Thank you! As Jake advised, we had to have the user with an already established account log in and delete their account so they could use that same email address on our primary instance.