System.Text.Json.JsonException: A possible object cycle was detected which is not supported. This can either be due to a cycle or if the object depth is larger than the maximum allowed depth of 32.

shuhelohelo.hatenablog.com

            services.AddControllers().AddNewtonsoftJson(settings =>
                settings.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore);

Thanks!