3819613 - Why am I unable to assign an Invoice to one of the Test user?

I tried to assign an Invoice to one of my test users, however I am unable to do so. I cannot find the user's name. Why does this happen?

Invoice > User Administration

Concur Invoice all versions

Admin would like to know the reason why she is unable to assign an Invoice to a test user. , KBA , CON-EXP-ADM-TUA , Test User Admin , Problem

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