When I've seen the above mentioned issue occur, I've had to go into the Automation > Sunrise/Sunset option and re-submit in that section first.
Choose "Select City" (even if your city is already selected), then "Use These Settings". The "Time Zone" option should be purple in color now, press "Calculate", then "Send to Control". I usually hit "Save" then to get rid of the Yellow highlights. Now go back into Account Details, M1XEP setup, and Test your time server setup.