Watch PeerTube together online
PeerTube is made of independent instances, so use the full URL for the chosen server and video. BlaTube recognises normal /w/ and /videos/watch/ paths when that instance permits viewing and embedding.
Instance settings matter
Federation can make a video discoverable across servers, but availability, privacy, removal and embed policy belong to the specific instance. The room uses the URL you supplied; another copy or federated listing does not automatically have the same access rules.
If an instance is unavailable, blocks embedding, or requires sign-in, BlaTube does not work around it. Check the source page and use another permitted URL only when it is available to the group.