How to Say "duly" in Spanish
The Spanish word for “duly” is “debidamente” — B2 level.

Examples
Los documentos deben estar debidamente firmados.
The documents must be properly signed.
El personal está debidamente capacitado para esta tarea.
The staff is duly trained for this task.
Asegúrese de que el equipo esté debidamente instalado antes de usarlo.
Make sure the equipment is correctly installed before using it.
Adverbs ending in -mente
Just like '-ly' in English, Spanish adverbs ending in '-mente' describe HOW an action is done and never change their form, regardless of whether you are talking about a man, a woman, or a group.
Positioning 'debidamente'
This word usually comes after the verb it describes, or between a helper verb (like 'está') and a description (like 'firmado').
Confusing 'debido' and 'debidamente'
Mistake: “El contrato está debido firmado.”
Correction: El contrato está debidamente firmado. Use the adverb ending in '-mente' when you are describing the action of signing, not the contract itself.
Related Translations
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