Youtube Feed issue, [Untitled] or "Broken feed"

#1

I’m trying to add the WarThunder channel.

When I add it using the username as the URL is on the videos page i get a feed titled [Untitled] with no items.
https://www.youtube.com/user/gaijinent/videos
https://newsblur.com/site/7747042

When I add it using the channel id as shown on the channel page (also tried this with /videos added to URL) it gets added with a proper title but the last item is from June 2019 even though the oldest in the feed if visited is from January 2020. SIte settings show say Broken feed (551)
https://www.youtube.com/channel/UCPZsNertSS82YCT2qX9-wHA
https://newsblur.com/site/5977865