Ah, yes, thank you so much! I applied those patches to my NVRAM, and now AirPlay and Handoff are working perfectly. Your help is greatly appreciated!
I have one more question, if you don't mind. I've been struggling to get iMessage and FaceTime to work on this Sequoia build. They keep force-logging me out. In the past, I had them working on Ventura using the ROM from my RTL8100 Ethernet MAC address.
Is getting iMessage and FaceTime to work on Sequoia typically more difficult, or am I just having bad luck? I've already tried clearing the cache and keychain and signing in and out, but the problem persists.
Thank you again for your time and expertise, MaLd0n!
Edit:
Could the hardware itself be a factor? Here are my config details:
My HD 530 is spoofed to an Intel(R) Iris(TM) Plus Graphics 640.
My chosen SMBIOS is an iMac (Retina 5K, 27-inch, 2019), which should use an RX 580 dedicated GPU.
I am using a valid serial number that shows "Purchase date unavailable".
I'm starting to wonder if this hardware and SMBIOS mismatch could be the root cause of my issues, especially with iMessage and FaceTime. Is this something I should be concerned about?