I was excited to try the new PlayStation remote play feature to PCs and Macs, but immediately ran into the error CE-35398-8. The automatic connection failed, as did the manual connection. The remote play app had the message “Cannot register the PS4”. The PS4 had a pop up with the error code CE-35398-8.
I was attempting to get this working on a 2015 Macbook Pro. It turns out a simple reboot of the Macbook made the error go away, and the PlayStation and remote play app were able to sync up.
Looking around online, it seems many encountered this issue, and rebooting the Mac fixed it.