Mobile notifications demo sample scene is broken and thrown NullReference and InavlidOperation exceptions on running the scene. Refer the attached video

Steps to reproduce
1) Create a new project
2) Window > Package Manager
3) Install Mobile Notifications > Import Sample package
4) Open Demo sample scene > Play

Actual result: NullReference and InavlidOperation exceptions on running the scene

Expected result: No exceptions should be thrown on running the scene

Occurring in: 2020.1.0b14 and 2020.2.0a16 with Mobile notifications package version 1.3.0

Note: Mobile notification demo sample has been included from package version 1.3.0

Environment: Both Windows and Mac