@sparkyinalaska
From what I can see, looks like LiveStream support ended for Roku in September 2022. Looks like still supported on AppleTV.
https://help.livestream.com/hc/en-us/articles/360002068827-Can-My-Stream-Be-on-the-Livestream-Roku-a...
From the general Livestream support page, looks like you can still use desktop/mobile browsers so would allow you to either cast to your Roku device or connect a laptop to your TV via HDMI cable and still stream the content.
https://help.livestream.com/hc/en-us/articles/360002050888-How-Do-I-Watch-an-Event-on-Livestream-
Roku Community Streaming Expert
Just another Roku user... I am not a Roku employee.
Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102