I get this on all of our systems that are located all over the US.

DELL System Update 2.0.2.0
Copyright (C) 2014 -- 2023 DELL Proprietary.
Verifying catalog installation ...
Installing catalog from repository ...
Fetching dsucatalog ...
Could not download the catalog. Please check the configuration
Progress report is available at:/usr/libexec/dell_dup/DSU_STATUS.json
Exiting DSU!

I can run:

wget https://downloads.dell.com/catalog/Catalog.xml.gz

without issues.  Is the DSU repository broken ?