Hello there and welcome to the Wowza support forum.
Double check what <HTTPStreamers> you have enabled in your Application.xml file, make sure
"cupertinostreaming"(HLS) is enabled to use
/playlist.m3u8. If it is an HLS is not working, you might try
"sanjosestreaming" (HDS) and use
/manifest.f4m in the playback URL