I have tried a few of the lemmy apps and most can't login due to some form of API/connection error, connect for lemmy I did get to login with but I can't do anything like vote on a post or post a comment or subscribe to a community (things which I assume use the API)
Are there any apps that do work? is the API disabled on hexbear for some reason?
https://vger.app/posts/hexbear.net/all
This is a web app so you can just install it to your home screen. Works really well for me.