Anonymous instead of nickname

Hello,
I am doing some testing to bring comments to my WordPress site through the fediverse more specifically I was mostly interested in Lemmy.

I noticed that entering @test@feddit.it automatically makes a post about that community and this post is linked to the blog post i.e. comments that are made about Lemmy (here https://feddit.it/post/4663522) show up on the WordPress post.

However, I cannot figure out why and as you can see all the users are called “Anonymous” and their nicknames do not appear instead.

I have installed both the ActivityPub and Friends plugins and WebFinger.

Thank you!

The page I need help with: [log in to see the link]