Is there any change in the .pac file distribution system from macOS catalina to macOS BigSur. Because, same .pac file is working on macOS Catalina but not on BigSur OS?
Is your PAC file locally hosted? If so, Apple deprecated local and FTP PAC files with Mojave in favor of hosting them on web servers via http/s. I’m not sure if or when support has been removed with Big Sur, but I suggest not pursuing them.
