My Samsung Galaxy Note 5 (which I’m no longer using as a phone) usually runs the Roon app, with which I can manually enter in text to perform album, artist etc. searches.
However, if I attempt to run the app on my Samsung Galaxy S8+, I am unable to use ANY keyboard app on that device to enter in text in the Roon app. The keyboard flashes up and then away every time. I have uninstalled Roon, the keyboard apps, returned to the default Samsung keyboard, rebooted the phone, but the problem persists.