Hi there! Looks like you linked to a Lemmy community using a URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: [email protected],
You didn't type @[email protected] though, you started typing and selected the dropdown box link. This creates a direct link to the user's instance, which isn't great.
If you type /u/username@instance then you will get an instance agnostic link, which will be in the viewer's instance. Eg /u/[email protected] - if you click View Source then you will see I did not type a link, yet when you hover over it the URL (for you) is https://lemm.ee/u/[email protected]. With an instance agnostic link you stay in your instance and see a federated version of the user's page, which allows you to do things like message them.
Edit: I don't see a link when using this method on Voyager or Jerboa, whereas @[email protected] does work. It seems Lemmy apps don't support your way of doing it yet.
I know I've comment-vomited all over this thread, but I just want to comment once more so that OP gets it:
The best form is /u/user@their_instance. This creates an instance agnostic link of the form https://your_instance/u/user@their_instance, eg /u/[email protected], which you will see as https://feddit.nl/u/[email protected]. This keeps the viewer in the instance they're logged into, so they can actually interact eg send a message.
Typing @user@their_instance on its own doesn't create a link. If you start typing @user then you'll get a dropdown box, however when you select that it creates a direct link in the form https://their_instance/u/user, which takes you to their instance, which you might not be logged into.
Even in the pre-0.18 versions of lemmy, you could use [link text](/u/user@instance) for an instance agnostic link. Now, you can just type /u/user@instance and the instance will automatically create a link.
eg /u/[email protected] (click view source to see the source does not have any link structure)
Your version will take people out of their instance and to feddit.nl.
Incidentally, if you select the username from the dropdown box that pops up when you type, then you get a direct link like yours, which is kind of crap.
If you use /u/ instead of the dropdown box you get an instance agnostic link. eg /u/[email protected]
You're in lemmy.zip, so the link you see will be https://lemmy.zip/u/[email protected], which keeps you in your own instance so that you can message them, etc.
Just typing @[email protected] without selecting from the dropdown box does not create a link.