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: !main@lemmy.ca

I believe Lemmy doesn’t federate users directly, the communities are the users. If on your mastodon instance you search for @main@lemmy.ca you can open that profile to see the posts in here.

(edited for clarity: you use @main@lemmy.ca instead of !main@lemmy.ca because communities are federated as users.)

it should be fixed now with the update to v0.18.1