Missing Dolby/DTS codecs in 2021

Since CC 2017, Adobe now no longer supports export/encoding to Dolby Digital. Although the patents for AC-3 expired in 2017, the expiration applies only to decoding (playback). Encoding AC-3 still requires license payments to Dolby Laboratories, which also now requires a very-high-priced perpetual license or one-time-purchase software. This is why Dolby support has been completely removed from all Adobe software beginning in 2017, while Dolby decoding support has been moved to the OS (Windows, macOS) natively.

Adobe never supported DTS at all.