I have several Roku Express 4K+ devices in my home and love using the Roku iOS app to control them. I recently replaced the main one we use in my living room with a Roku Ultra and the app cannot find it. It just keeps saying "Searching for Devices". Deleted and reinstalled and still not joy, not on my iPhone or iPad. Configured it to allow, selected Permissive. I only have one wireless network so all devices are on the same network. It finds the Express 4K+ devices fine but not the Ultra.