A Research Study Looking at How Different Doses of Study Medicine (Inno8) Work in the Body of People With Haemophilia A

Inclusion Criteria: * Male * Age 18-64 years (both inclusive) at the time of signing the informed consent. * Body weight greater than or equal to (≥) 45 kilograms (kgs). * Diagnosis of congenital haemophilia A with factor VIII (FVIII) activity less than or equal to (≤) 15 percentage (%) with or without FVIII inhibitors, based on medical records. Exclusion Criteria: * Current or prior exposure to any prophylactic treatment for haemophilia A within 5 half-lives of the medicinal product by the time of screening. * Body mass index ≥30.0 kilogram per square meter (kg/m\^2). * Increased risk of thrombosis, e.g. known history of personal or first-degree relative(s) with unprovoked deep vein thrombosis. * Any clinical signs or established diagnosis of venous or arterial thromboembolic disease. * Any known coagulation disorders other than haemophilia A. * Ongoing or planned immune tolerance induction therapy. * Presence of clinically significant gastrointestinal disorders potentially affecting absorption of drugs and/or nutrients, as judged by the investigator.