Try-except-finally block won’t assign a variable within the except block:

 if "access_token" in result.keys():
        print("Successful token acquisition from:", result["token_source"])  # Since MSAL 1.25
        # Calling a web API using the access token
        r = requests.get(
            queryURL,
            headers={'Authorization': 'Bearer ' + result['access_token'], 'Prefer':'odata.include-annotations="OData.Community.Display.V1.FormattedValue"'},
            )
        t = r.text
        api_result = r.json()
        try:
            query = api_result['value']
        except KeyError:
(THIS LINE) query = api_result
            if 'error' in api_result:
                err_code, err_msg = api_result['error'].items()
                raise DataverseError(err_code, err_msg)
            raise NoValuesBlockError(api_result.keys())
        finally:
            return query
else:
        raise TokenAcquisitionError(value=result)

api_result.keys() = 
dict_keys(['@odata.context', '@odata.type', 'ParentOptionSetName', 'IsCustomOptionSet',
'IsGlobal', 'IsManaged', 'Name', 'ExternalTypeName', 'OptionSetType', 'IntroducedVersion', 
'MetadataId', 'HasChanged', 'Options', 'Description', 'DisplayName', 'IsCustomizable'])

but query isn’t assigned to api_result in the highlighted line.

There is a case where there will be no values block, nor an error block, that should be caught and still returned.