Premiere won't export my audio

So I’m helping a friend of mine edit a music video for a cover he made, I’m working with various clips, transitions, text effects and various audio clips, both mono and stereo. In the early stages, when I had nothing but the intro in the timeline I exported the video to see if the text effect looked good, said render had the two mono clips and it worked just fine. Fast forward to today, I’m halfway trough the song and I’ve imported the .wav (the master audio in stereo) and I have a lot of footage and transitions. Anyways, I was trying to see how another effect would look like in which I gradually slowed down a video clip until it was paused, and I exported the specific part where the effect was used, surprise surprise the .mp4 that comes out has no audio. I’ve already tried watching it on another device, exporting again, restarting, I’ve used the song in another project and when I export it, it comes out fine, so I know it’s not the .wav file, I checked all boxes are ticked and that the audio layer isn’t muted. I appreciate if any of you knows what is going on. I can give more details if I missed something. Thank you very much Edit: I also dragged the .mp4 result back into premiere and it shows audio in the timeline and sounds like it I should, it just won’t play in anything that is not premiere.