When attempting to connect to an online tenant of Business Central using the BC provider you encounter the following error:
Error: Error opening connection to BC Cloud: System.ApplicationException: Invalid response from Business Central calling API GetLanguage
This is a known bug with the Jet Analytics market place extension.
1. In BC, search for Web Services.
2. Sort by the Object ID column in descending order and locate Object ID 14125509.
3. Click Edit List and change the Object ID to 14125508.
After the change you should be able to connect to the BC database via the BC Provider.