Hi,
in a shared task, i cannot remove my own comments, only the ones of my colleague.
Am i missing a setting or is this not possible for now?
Kind regards 
That could be a UI bug. API-Wise, everyone with write rights to the task can remove comments, including link shares. It looks like because these rights are calculated dynamically they don’t (didn’t) get added when you’re adding a new comment to a task. But because the comments of your colleague are already loaded they get the “remove” button in the UI. I’ve pushed a fix for that here, please try once the CI released a new version.
I hope I understood you correctly, if not please give me a list with clear steps to reproduce the issue