Hey Anna,
First is necessary to set a Debugger Key on the pipeline library. Once you set it, you can not see again. So you need to store it in a safe place.
In environment must have a different debugger key.
The configuration should be similar to this one:
In Studio, you should connect the debugger by selecting the second option:
As a password, use the debugger key.
Doc related with debugging: https://docs.mendix.com/refguide/debug-microflows-remotely/
Best Regards,
Ricardo Pereira