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: !asklemmy@lemmy.ml,
You didn't type @Magrid@lemm.ee 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/UnanimousStargazer@feddit.nl - 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/UnanimousStargazer@feddit.nl. 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 @TWeaK@lemm.ee 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/tweak@lemm.ee, which you will see as https://feddit.nl/u/tweak@lemm.ee. 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.
Depends on your instance. Over at lemm.ee, the web version is arguably better than Jerboa, for example. However our lead admin sets things up just so, and includes various mods he made and pushes into the main code stack.
Also, I'm not sure if the instance agnostic links give you a mention. The devs really need to tie all this together, with mentions for the agnostic links, and auto-generated links with @user@instance so you don't have to type out the full link code.
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/UnanimousStargazer@feddit.nl (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.
It's not @, you want to use /u/, eg /u/user@their_instance. This creates an instance agnostic link where the viewer sees the user in their own instance, where they're logged in, so they can message you. When you hover over it says https://your_instance/u/user@their_instance. The source of the comment has no link structure, the viewer's instance creates the link, so long as it's on version 0.18 or newer.
The confusion is that when you start typing you get a popup window where you can select the username. However this creates a direct link with text @user@their_instance but the link is https://their_instance/u/user. When you view source you see a full link created as [@user@their_instance](https://their_instance/u/user).
Hopefully in a future version they'll fix the drop down box to create agnostic links. It seems like they overlooked that in the 0.18 update.