Prior to the Course Start date, the course does not appear on the Mobile Dashboard, even for Teacher or Non-editing Teacher roles. The Teacher / Non-editing Teacher can use the Mobile "Search" facility and find / open the course that way, but not via the dashboard. The course DOES appear on the web interface dashboard for those roles, even prior to Course Start Date.
Once the Course Start date is passed, the course appears on the Mobile Dashboard as expected.
Using Moodle 3.9.1 and Moodle Mobile 3.9.4. We are not disabling any Mobile features. Have tested in Android but not iOS.