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The only reference I could find to a "Not support!" error was last fall when they were rolling out Roku firmware version 9.2. Most people reported that restarting their Roku took care of the problem.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking " Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X