After Effects Warning: Cannot Output to this format because it is not currently installed (33 :: 99)

Having the same problem since installing catalina. Has anyone found a solution to this yet??

I have the same problem.. did you find a solution? 

You said, " I would like to export directly out of AE as lossless to H.264 if possible."

H.264 is an interframe MPEG codec that not only compresses color and averages motion between I, P, and B frames (read up Inter frame - Wikipedia). It cannot be lossless. It is very good at doing what it is designed for: Delivering an acceptable quality playback using a low data rate and small file size to consumers. It is a terrible production format. It should only be the very last step in your production process, not the first. 

If you want to deliver the highest quality content to a consumer then you should be using the Adobe Media Encoder or some other compressor to render your final edit to a standard delivery format like H.264, but unless you are an expert, you should not mess with the presets. About the only safe thing you can change without a thorough understanding of the process is to enable multi-pass rendering, but the advantage of MP rendering is almost always lost if you use any of the standard streaming services (YouTube, Vimeo) to show your work because they will re-compress your work using their own software to prepare it for distribution. The farther your work is from their recommendations the bigger the hammer they use to re-compress your work. Follow the guidelines and use H.264 for distribution and you will be as happy as you can be with the result.

Update these are my options when I open the output module and do the format dropdown