are those different IDs referring to 2 different Concur system instance? (meaning if the user is set up within 2 different companies?)
Also, maybe can you precise what do you mean with 2 IDs? Email address? Login details? Employee ID number? I assume you meant 2 different login details, but please precise if you do know. Thank you.
@xipugori if you have to user IDs then I think you have two different user accounts (profiles) for one person. If that is the case, they cannot be merged. You will need to deactivate the profile with the user ID that does not need to be used. As far as the Concur system, it sees these two User IDs as two separate users.