【Confirm ECO Mode is off】
While ECO Mode is on, notification will not be called.
【Understanding iOS spec】
Notification is called when route guidance timing comes to wake up sleeping Apple Watch.
Due to iOS specification, when iPhone is waking, notification will pop up to iPhone.（iOS thinks user is using iPhone and user focus is to iPhone.）
Notification style is by Settings.
When iPhone displays this app, no notification is occurred because iOS thinks user is using this app, so no need to notify.
While iPhone is sleeping, notifications appear to Apple Watch.
【Notification does not open automatically.】
When Notification Privacy is on, notification details will only appear when you tap on an alert.
Please set Notification Privacy off.