Hi @<1523701827080556544:profile|JuicyFox94> I figured out what the problem is! For some recent experimentation I set an acces_key and secret_key as environment variables in my os. When I deleted them everything worked fine so the environment variables overwrote the keys given by the clearml.conf. Is that the desired default behaviour?
And just one tip for everbody having similar problems: Switch to using the SDK instead of the CLI for better debugging. This helped me to find the cause of my issue. :)