3814429 - Why do I see the message "You are not allowed to have delegates" when adding a new delegate to a user?

I'm trying to add a new delegate, but receiving the message "You are not allowed to have delegates". What is the problem?

Expense > Delegate Configurations

Concur Expense all versions

Not able to add new delegates due to message "You are not allowed to have delegates". , KBA , CON-EXP-ADM-DEC , Delegate Configuration , Problem

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