If you want to utilize Google IMA SDK as your player ad technology make sure to follow these steps:
1. In players list click on the player you want to edit.
2. In Monetization section, under the Advanced, make sure to select "Google IMA SDK" for Ad Parser
3. Make sure to save your changes and allow up to 20 minutes for the changes to propagate.
After this is done, you player will utilize Google IMA SDK on both desktop and mobile devices.