I just installed latest beta of Roon Remote on my android smartphone (Samsung S22 Ultra). The app is blocked in every feature, cannot play music, cannot enable notifications, it is unresponsive, totally blocked ! It depends maybe from the problem i posted about Roon Server disconnections?
Did you install the beta (Early Access) of the Roon Server as well? The beta versions of the apps are not guaranteed to work with the regular production release versions of the server.