~という理由で (on the grounds that)

The set frame [noun/clause]+という理由で, 'on the grounds of X / on the grounds that X / for the reason that X / on the basis that X.' Combines ~という (label/quotative) with 理由 ('reason') and the causal で. Used in formal explanations and legal/business writing to attribute a stated reason to an action. Feels objective and slightly formal, fitting explanations and arguments.