@steyrs
Just some information I am sure you are aware of, but I want to provide it just in case. Typically when SCCM is the primary driver for updates in a domain we do not want to set the WSUS location with GPO. If you have only one WSUS, then it can work out if your GPO points to your SUP / WSUS. However, if you have more than one SUP, you can encounter issues where GPO overrides the SCCM wanted location (especially in fallback scenarios). It can work but can also cause headaches. I understand that some organizations require the GPO be set, so if you can't for your environment I completely understand!
For more information please review:
Manage settings for software updates - Configuration Manager