I have a similar problem - noted this on 7-26-2022. I have a Roku TV with the Roku channel added as a channel. I was away for a week and Reuters ( CH 174) on the RoKu Channel is missing from the listing.
The stand-alone Reuters was no longer available a while back, and now the Roku Channel Live TV (ch 174) does seem to be removed/missing.
You can watch Reuters still on Youtube if you want (https://www.youtube.com/c/Reuters/featured), but currently indicating 44 people watching one of their livestreams, and 39 people watching their other livestream. Those numbers may be telling why they decided to no longer keep their streaming channel active or there may be insufficient demand to carry it by live tv streaming providers.
Thanks, reassuring to know my age wasn't catching up to me. I wish Roku do be better at corresponding to its subscribers on things like this. I wasted a lot of time trying to figure out what was going on.
For more information about Reuter's availability on our platform, you'll want to contact the channel's customer support team to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.