Well, I don't know whether to call this funny or just sad..  I turned off secure boot and retried the firmware update.  It again failed.  But having read some other posts about firmware update problems, and how some people were railing against Windows Update, I checked to see if WU had the firmware update in their supplemental updates, and it was there.  Tried it and it worked with issue... So Microsoft was able to update a Dell firmware update that Dell was not able to complete.  I guess I am leaning towards SAD....
My Dell XPS 8930 did not have TPM 2.0 and secure boot turned on, so I enabled the in BIOS/UEFI. Then it would not update to Firmware 1.1.18 when it was available on SupportAssist. I turned off Secure Boot and it installed with no problems. I turned Secure Boot back on, and it upgraded to Windows 11. It has failed to install any Firmware since then. Currently Firmware 1.1.22 fails to install via SupportAssist. Any thoughts on how to get this to install without turning off Secure Boot and risking boot problems to get this update to install?
XPS 8930, UEFI BIOS updates fail since Secure Boot turned on