Guess what? Your system does not meet minimum system requirements for hardware-accelerated encoding in versions 23.3 or newer. You'll need a 7th-Gen Intel or newer CPU to enable hardware encoding for the profiles that you're trying to encode with.
And your CPU is now officially declared "obsolete" at Intel itself: All support and driver updates for that CPU and all other 6th-Gen Intel CPUs had been completely terminated effective at the end of last year. Only archived drivers are available from that point onwards. As a result of that, the next forthcoming major version of Premiere Pro will be permanently locked to software-only everything - rendering, encoding and decoding - with all 6th-gen CPUs that rely solely on integrated Intel HD Graphics.