As quoted from the linked post.
It looks like you’re part of one of our experiments. The logged-in mobile web experience is currently unavailable for a portion of users. To access the site you can log on via desktop, the mobile apps, or wait for the experiment to conclude.
This is separate from the API issue. This will actually BLOCK you from even viewing reddit on your phone without using the official app.
Archive.org link in case the post is removed.
I only just started with Lemmy, but the only thing I’ve noticed that needs improvement is discovering and subscribing to communities. This business of searching in a second browser window for communities other instances and then copying the URL into your own instance’s search box is way too clunky. Lemmy needs a way for each instance to carry metadata about the other instances’ communities so you can subscribe to them just by searching for their names and pressing a button.