Hi SweetBadger76 , thanks, I think I've made it work. The main point of confusion was between dealing with different type of Task objects (i.e. clearml.backend_api.services.v2_13.tasks.Task returned by get_all , which don't have any of those methods).
Interestingly, set_parameters didn't just work as expected, I had to flatten the dicts myself (which clearml apparently does on its own when I call set_parameters on a new task.
Thank you all. 🙏