Tandem made backwards-incompatible changes to Tandem Source's internal API which broke tconnectsync on June 30th. As a result, tconnectsync v3.0.0 and above are now needed to connect to Tandem Source.
All existing users of tconnectsync on older versions are affected, as the older API endpoints stopped working overnight with no warning. You must upgrade to v3.0.0 to resolve these "TandemSourceApi HTTP 404" issues.
As this change was unexpected, there may still be issues needing attention. If you run into any issues after upgrading, please open a new issue or comment on #146.