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This paper addresses the automation of reasoning with deontic STIT logics by means of proof theory. Our methodology consists of leveraging sound and cut-free complete sequent-style calculi to write a proof-search algorithm deciding deontic, multi-agent STIT logics with (un)limited choice. In order to ensure the termination of our proof-search algorithm, we introduce a special loop-checking mechanism. Despite the acknowledged potential for deontic reasoning in the context of autonomous vehicles and other areas of AI, this work is the first to provide a syntactic decision procedure for deontic STIT logics. Our proof-search procedures are designed to provide verifiable witnesses/certificates of the (in)validity of formulae, which permit an analysis of the (non)theoremhood of formulae and act as explanations thereof. We utilize our proof-search algorithm to address agent-based normative reasoning tasks such as compliance checking.