I moved this to the Web Data Connector portion of the Community where you are more likely to receive a helpful response.
I am not sure if anyone wrote an Excel Online / Office 365 connector yet. The Google Spreasheet WDC is not compatible with that for sure.
What exactly you are trying?
I've searched online and in the tableau community. It doesn't seem like anyone has developed a o365 excel data connector yet.
Can anyone speak to this?
I'd also like information on this.