[enuddleyarbl]

EDIT: Well, I rebooted the computer and the Sage, reconnected and the problem didn't recur. So, whatever it was, it appears to have gone away.

OP: I'm not sure where to report this. But, I just connected my Kobo Sage to Calibre and up popped the following error:

calibre, version 6.21.0
ERROR: Unhandled exception: <b>HTTPError</b>:HTTP Error 403: Forbidden

calibre 6.21  embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.10.1
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
Successfully initialized third party plugins: DeACSM (0, 0, 16) && DeDRM (10, 0, 3) && Diaps Editing Toolbag (0, 4, 0) && EpubCheck (0, 2, 4) && EpubSplit (3, 6, 0) && Goodreads (1, 7, 9) && KindleUnpack - The Plugin (0, 83, 1) && Kobo Utilities (2, 16, 7) && KoboTouchExtended (3, 6, 3) && Modify ePub (1, 8, 1) && Quality Check (1, 13, 4) && ScrambleEbook (0, 6, 0)
Traceback (most recent call last):
  File "calibre_plugins.koboutilities.action", line 329, in _on_device_metadata_available
  File "calibre_plugins.koboutilities.action", line 1240, in auto_firmware_update_check
  File "urllib\request.py", line 216, in urlopen
  File "urllib\request.py", line 525, in open
  File "urllib\request.py", line 634, in http_response
  File "urllib\request.py", line 563, in error
  File "urllib\request.py", line 496, in _call_chain
  File "urllib\request.py", line 643, in http_error_default
urllib.error.HTTPError: HTTP Error 403: Forbidden

I'm not sure what the problem is or what the result of that error is. But, I thought I'd report it.