The tap in/out functionality on mobile goes through an authorisation workflow, if authorisation rules are set up for timesheets.
The clock in / out features that bypass the authorisation flows are:
TapInTapOut iPad solution (PeopleHR: Timesheets - TapinTapout on iPad).
Tap-in Tap-out web solution (PeopleHR: Use Tap-in Tap-out on web).