Recurring appointments are not appearing in calendar on Android phone. This occured since the last Touchdown upgrade.
TD HD 9.0.00437
Android version 7.0
Can you email firstname.lastname@example.org so we can get some logs?
I do have the same problem on Samsung Galaxy S7 and Version 9.0.00412.
Only one time appointements are loaded from "outlook" into TouchDown, the recurring ones do not.
Are you connecting in a non-activesync protocol to an Activesync enabled server?