Xero is currently not a supported app:
See this link here which redirects to support page and scroll down.
https://support.9spokes.com/hc/en-us/articles/217211447-I-m-using-an-app-I-don-t-see-in-9-Spokes-
Screen shot:
I have also logged into the dashboard just now and can confirm that it still not available as of today.
