Slack Desktop wont open on login

There seems to be no answer from public so I asked the Slask support desk and here is the response.

Sorry for the troubles with that Launch On Login setting! This is sadly a known bug that the Windows engineers are working on at the moment.

I don't have an ETA to give on when the bug might be resolved, but I have attached this ticket to our internal bug tracker for you. As soon as I hear of any news or updates, I will let you know right away!

Since this is not the answer, I will wait if others have workaround for this. If not, I will close the question in a week.