Task:  Open the Yahoo Mail App, Go to the Overflow Menu Icon to Allow All Notification. 
Steps:
Open the Yahoo Mail App
Click on the Overflow Menu Icon in the top left corner of the screen 
Go to the Notifications Option 
Click on the Allow Notifications Button 
Select the Allow Option to Enable the All Notifications 
Toggle on the switch for the Expiring free trials 
Toggle on the switch for Breaking News