Please see console log:
File found: .././d-nigtio-ios/nigtio-build/platforms/ios/build/Debug-iphoneos/d-føtex ud af huset.ipa
Creating an upload resource.
Create upload resource successful.
Uploading app to resource.
io.jenkins.plugins.appcenter.AppCenterException: Upload to AppCenter failed.
at io.jenkins.plugins.appcenter.task.UploadTask.call(UploadTask.java:56)
at io.jenkins.plugins.appcenter.task.UploadTask.call(UploadTask.java:17)
at hudson.remoting.UserRequest.perform(UserRequest.java:210)
at hudson.remoting.UserRequest.perform(UserRequest.java:53)
at hudson.remoting.Request$2.run(Request.java:364)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at hudson.remoting.Engine$1$1.run(Engine.java:94)
at java.lang.Thread.run(Thread.java:748)
Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to JNLP4-connect connection from ip--1.compute.internal/:52470
at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1743)
at hudson.remoting.UserResponse.retrieve(UserRequest.java:389)
at hudson.remoting.Channel.call(Channel.java:957)
at hudson.FilePath.act(FilePath.java:1160)
at io.jenkins.plugins.appcenter.AppCenterRecorder.uploadToAppCenter(AppCenterRecorder.java:131)
at io.jenkins.plugins.appcenter.AppCenterRecorder.perform(AppCenterRecorder.java:118)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:79)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
at hudson.model.Build$BuildExecution.post2(Build.java:186)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
at hudson.model.Run.execute(Run.java:1843)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:429)
Build step 'Upload app to AppCenter' changed build result to FAILURE
Finished: FAILURE

Upload fails always, appname, owner etc are all correct which proves i think fact that resource is ready to be uploaded. Only thing which comes to my mind is letter "ø" in ipa name. Let me know if any additional info on help is needed.
THanks