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

Who May Qualify: - Male - Age 18-64 years (both inclusive) at the time of signing the willing to sign a consent form. - 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. Who Should NOT Join This Trial: - 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. Always talk to your doctor about whether this trial is right for you.