Daniele,

Currently satpy has to be fixed for that. I made a PR that is not yet merged into the main branch.

Read the whole story here:
https://groups.google.com/g/pytroll/c/qjg5zddABA0

Check in the PR my fixes here:
https://github.com/pytroll/satpy/pull/2122/commits/f54d6d3f86f571f9055a832caf229ad155251e02

You can either apply these easy edits manually or you have to wait and update when satpy is ready.

To make my scripts ready for MSG2/3/4 you also have to add the needed files and the abbreviation:

...
'night_ir_with_background_hires': ['IR_039', 'IR_108', 'IR_120'],
...

...
 'night_ir_with_background_hires': 'night_ir_wbh',
...

Best Regards,
Ernst