This trigger enables bluetooth when the user is detected to be biking. Since such detection is performed via sensors/GPS those shall be active in the device. Settings restricting the activation of these may affect the proper function of this trigger. In particular in order to work at its best the "Location" settings (settings > Location > Mode) shall be set to "High accuracy".
In order to add or modify this trigger the days of the week when active shall be specified. By clicking on the checkbox on the right side of each day it is possible to activate/deactivate them.