My videos are turning to mp3 files

[Lilly5D87]

I have been using Adobe Media Encoder 2021 to render my After Effects (2021) videos. I have had no issues, and have had the choice to switch the videos from MP4 files to MP3 files when i feel necessary. For some reason though, as of yesterday, every after effects project i put on Media Encoder shows as an MP3 file and wont let me change it. I have been have to use handbrake again to render which is extra work. I hate that this has worked perfectly for me for months and now all of the sudden it isn't even something I can use. I use a Macbook air 2017 and doubt it's an issue with my computer. I have attached a photo of what all of my files have been looking like when i put them on Media Encoder.  

[Warren Heaton]

Click on the Format pop-up menu (set to MP3 in your screenshot) and change that to H264 or HEVC (H265).  You will then have MP4 presets in the Presets pop-up menu.

[Lilly5D87]

unfortunately that isn't showing as an option. It used to, but now MP3 is the only option for my files. 

[Warren Heaton]

Use Creative Cloud Desktop to uninstall and then reinstall Adobe Media Encoder.