A Study to Look at How Safe NNC0268-0965 is in People With Type 2 Diabetes

Inclusion Criteria: * Male or female, aged 18-64 years (both inclusive) at the time of signing informed consent. * Diagnosed with type 2 diabetes mellitus 180 days or more prior to the day of screening. * Male subject or female subject of non-child bearing potential. Non-child bearing potential being surgically sterilised (i.e. documented hysterectomy, bilateral salpingectomy or bilateral oophorectomy) or being postmenopausal (as defined as no menses for 12 months without an alternative medical cause) prior to the day of screening. * Current total daily insulin treatment between 0.25 (I)U/kg/day and 1.2 (I)U/kg/day (both inclusive). * HbA1c equal to or below 9.5% Exclusion Criteria: * Male of reproductive age who, or whose partner(s), is not using adequate contraceptive methods (adequate contraceptive measures as required by local regulation or practice). Adequate contraceptive measures include that the male subject uses a condom during intercourse and that the partner practices adequate contraception (risk of pregnancy must be lower than 1%). * Use of GLP-1 receptor agonists (e.g. exenatide, liraglutide, semaglutide) within 3 months prior to screening.