I've been having nothing but trouble with trying to get Windows 10 clients to update properly. We recently started using Windows 10 in our company and I have a few clients that report and update successfully. I have more that don't. They show up in PM as contacting, but either no date of reporting or a older date. (see sceenshot).

Our Wsus server is server2012 r2. I can't seem to get any consistent results. Any advice/suggestions would be greatly appreciated. I'm not sure if it's a windows 10 version issue or what.
Thanks in advance.