Premiere and AE uses the same MPEG-2 export engine. It’s a waste of time to render out from AE to bring the resultant file into PPro. Did you try to import the AEP into PremierePro, a copy and past of AE’s Timeline?
If you’d like to have player controls for your audio and movies in PowerPoint, then select, embed media object. I may be wrong with the actual phrase used in the menu. But it’s different from the add audio/movie menu command, which doesn’t provide a playback controller.
Cheers
Roland Kahlenberg
https://www.broadcastGEMs.com – Adobe After Effects project files
https://www.myspace.com/rorkrgbspace