User cannot be authenticated (Samsung + Roku)

Hello. I am trying to login to my Plex account on my Samsung TV via Roku. However I keep getting this error “User cannot be authenticated. This IP appears to be having trouble signing in to an account (detected repeat failures). I have tried changing my password multiple times, and despite entering it correctly I face this error. How can I fix this? I am trying to access my streaming library hosted on my seedbox. Have no issues logging in or access my library via browser or desktop app. Many thanks!

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