How is your Shudder subscription obtained? Directly with Shudder on its web page? Through Roku on The Roku Channel? Through some other third party?
How are you attempting to access Shudder on the Roku? Via the Shudder channel app? Via The Roku Channel?
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.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X