Lemmy.sdf.org is where my main is hosted, but they’re currently down (as is their pixelfed instance)

It’s not just you / a regional block.

It’s Lemmy World’s tokens being invalidated (because of the back) that’s causing the issue, not Liftoff (source: I had the same issues with Connect)

Clearing your app cache, and signing out and back in, ought to solve it.

Try clearing cookies (or app cache, on app), that will most likely resolve the issue.