@CJN2
I thought some Roku updates finally addressed some of these HDCP errors.
Problem is some HDMI devices/cables/peripherals just don't play nicely together and sometimes the HDCP communication goes askew.
Placing an HDMI splitter which ignores HDCP requests is sometimes the only way to resolve these annoyances. (short of waiting for updates from different manufacturers which may or may not come).
Try reading through this article and purchasing the ViewHD splitter mentioned. https://www.howtogeek.com/208917/htg-explains-how-hdcp-breaks-your-hdtv-and-how-to-fix-it/. They have others like 4 ports etc. depending how many devices/inputs you need. OREI also makes a splitter that will apparently work, but I can only vouch for the ViewHD.
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, 4802, 4850, Premiere+ 3921, Express 4k+ 3941, Streambar 9102