Twitter's API has been down for a day or so. I guess Elon's making some poorly planned changes behind the scenes.
Third party clients not working anymore until it's fixed so I installed the official Twitter client.
The official app is so bad - "the algorithm" puts tweets all out of order which is why I switched to Talon in the first place.
I don't know why it can't just have an option to put all Tweets in sequence.
Anyway I hope it's fixed
https://twitter.com/TalonAndroid