Hi there! Looks like you linked to a Lemmy community using an URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: !mastodon@lemmy.ml

From mastodon (should be in any app) you can search for a lemmy community as @<community>@<instance> and it should be shown as a group. You can then follow the group (every comment of every post in the community will be boosted by the group). Depending on the Mastodon client, you should be able to select any comment, and get the threaded view up to the original post.