This might be caused by your VM “disp4478” not being tagged as anon-vm.
/etc/qubes-rpc/policy/whonix.SdwdateStatus in dom0 basically states that if tag:anon-vm is not connected on the other end it will be denied.
To add tag to your VM, you can use qvm-tags commands:
[@dom0]$ qvm-tags VMNAME add anon-vm
Also before you add, you might want to check the tag list of a VM:
[@dom0]$ qvm-tags VMNAME list