DELL Command Update command line interface /applyUpdate failures; v4.3

Dell Command | Update Version 4.x Reference Guide
Steps:
Open interactive command line interface on remote workstation
Execute dcu-cli.exe /applyUpdates -updateType=bios,firmware,driver -autoSuspendBitLocker=enable -outputLog=C:\Temp\scanOutput.log
Command fails with return code 500 (see log output below)
I’ve omitted all commands except /applyUpdates -updateType, but I am still getting the same result. I've also tried a single -updateType one at a time.
I can ping downloads.dell.com and dellupdater.dell.com.
I’ve attempted this on different Latitude models over a number of days.
Any help would be appreciated.

[2021-08-16 11:40:42] : The computer manufacturer is 'Dell'
[2021-08-16 11:40:42] : Checking for updates...
[2021-08-16 11:40:43] : Checking for application component updates...
[2021-08-16 11:40:45] : Determining available updates...
[2021-08-16 11:40:45] : The scan result is DOWNLOAD_ERROR
[2021-08-16 11:40:45] : INDEX_CATALOG_FAILED_DOWNLOAD is flagged in the scan results
[2021-08-16 11:40:45] : The catalog CatalogIndexPC.cab failed to provide any result
[2021-08-16 11:40:45] : The service provided this message 'Catalog download failed [https://downloads.dell.com/catalog/CatalogIndexPC.cab]'
[2021-08-16 11:40:45] : The service provided this message 'Catalog download failed [https://dellupdater.dell.com/non_du/ClientService/Catalog/CatalogIndexPC.cab]'
[2021-08-16 11:40:46] : Execution completed.
[2021-08-16 11:40:46] : The program exited with return code: 500
[2021-08-16 11:40:46] : State monitoring instance total elapsed time = 00:00:04.8709729, Execution time = 9mS, Overhead = 0.194844032082379%
[2021-08-16 11:40:46] : State monitoring disposed for application domain dcu-cli.exe