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_acquire_via_az_cli runs 'az account get-access-token' with text=True, so subprocess.run decodes stdout with the locale encoding and raises UnicodeDecodeError (a ValueError sibling, NOT a JSONDecodeError) when the output can't be decoded. That escaped the except (OSError, TimeoutExpired, JSONDecodeError, KeyError) tuple and crashed a helper whose contract is to return str | None. Add UnicodeDecodeError to the tuple. Test patches subprocess.run to raise UnicodeDecodeError and asserts resolve_token returns None (fails before: the error propagated). Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>