Branch office clients not detecting Windows Updates from their local distribution point

[RealRider]

I have SCCM 1706 in my company headquarters, and I have distribution points in my branch offices.  The computers in my headquarters are able to detect, download and install Windows updates from the local DP, but none of the branch office clients are able to detect any of the updates even though the updates are distributed to all the DPs.  I was able to deploy applications to those DPs and the branch office clients were able to install the apps from those DPs, but I don't know why it doesn't work with Windows updates.  Right now all the DPs have Component server, Distribution point, and Site system roles installed, do I need additional roles for them to work?  Please let me know how to fix this problem or point me to the right direction.  Thank you for your help.

[RealRider]

If I go to the properties of the boundary groups that I created for remote sites, on the References tab, under Site System Servers, I have the remote site's distribution server, should I also add my primary site server, which has the software update point role installed?